eee Speicherkarte vollständig löschen

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Synapse
Neuling
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eee Speicherkarte vollständig löschen

Beitrag von Synapse » Sonntag 23. November 2008, 10:52

Hi,

gibt es eine Möglichkeit die Speicherkarte des eee vollständig zu löschen, so das eine Datenwiederherstellung für Privatpersonen nicht mehr möglich ist ?
Reicht es aus den eee in den Auslieferungszustand zu versetzen (F9) ?

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k0k0
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Re: eee Speicherkarte vollständig löschen

Beitrag von k0k0 » Sonntag 23. November 2008, 11:04

Was willst Du nun? Den Originalzustand wiederherstellen oder die SSD löschen? Ersteres geht unter Xandros-eee mit F9, letzteres dann, wenn man den Zwerg mit einem anderen OS bootet und die SSD dann vollständig mit Müll, Nullen, ... überschreibt.
Downloads zu Netbooks (wie den ASUS EeePCs, Acer Aspire One's) und vielem anderen
701 / 901(GO) / 1000HG(O) & Leeenux / WXP - 2 GiB RAM - 16 GB SDHC - Huawei E220 & EM770 / ZTE MF628

Synapse
Neuling
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Re: eee Speicherkarte vollständig löschen

Beitrag von Synapse » Sonntag 23. November 2008, 11:18

Hi,

wenn mit dem herstellen des Originalzustands verhindert wird das man die gelöschten Daten nicht wiederherstellen kann dann würde mir das reichen.

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Lorag
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Re: eee Speicherkarte vollständig löschen

Beitrag von Lorag » Sonntag 23. November 2008, 11:35

Für Festplatten gilt:

Um Daten nachhaltig zu löschen gibt es in Linux-Systemen den Befehl wipe. Da es im Normalfall reichen sollte die persönlichen Daten zu löschen, muss man sich nicht unbedingt ein komplettes Neuaufsetzen des Systems (mit CD-Installation, etc) antun. Dazu lokalisiert man am besten zunächst das oder die Verzeichnisse, in denen sich Daten befinden. Dann reicht:

CodeCOLON Alles auswählen

wipe -r ~/meine/daten
Für SSDs gilt:

Wear-Leveling verhindert, dass es so einfach ist. Die Daten sind auch nach mehrfachem Überschreiben noch vorhanden. Wenn man die SSD mehrfach komplett wiped sollten sie wirklich weg sein. Tatsächlich sollte aber nach der Löschung der Zuordnungseinheiten (wie oben beschrieben) für Privatpersonen der Zugriff auf die physisch vorhandenen Daten kaum mehr möglich sein.

Wenn es also darum geht, dass Gerät für den Verkauf zu präparieren, reicht imo wipe und Anschließend F9. Bist du Träger von Staatsgeheimnissen hilft es, mit einem externen Datenträger zu booten.

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wipe -rcf /dev/sdX
... sollte den Rest erledigen (X durch den passenden Buchstaben ersetzen). Danach musst du neu installieren - der MBR ist dann übrigens auch weg.

Synapse
Neuling
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Re: eee Speicherkarte vollständig löschen

Beitrag von Synapse » Sonntag 23. November 2008, 11:50

Okay danke dann werde ich das mal probieren.

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xManuelx
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Re: eee Speicherkarte vollständig löschen

Beitrag von xManuelx » Sonntag 23. November 2008, 12:03

Lorag hat geschriebenCOLON Wear-Leveling verhindert, dass es so einfach ist. Die Daten sind auch nach mehrfachem Überschreiben noch vorhanden.
kann man das auch mit festplatten vergleichen bei denen die daten min. 35 mal überschrieben werden müssen dass sie auch wirklich weg sind?
wo liegt eigentlich der unterschied zwischen shred und wipe?

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vofiwg
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Re: eee Speicherkarte vollständig löschen

Beitrag von vofiwg » Sonntag 23. November 2008, 13:16

man wipe:

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WIPE(1)                          User Commands                         WIPE(1)



NAME
       wipe - securely erase files from magnetic media

SYNOPSIS
       wipe [options] path1 path2 ... pathn


CURRENT-VERSION
       This  manual  page  describes version 0.21 of wipe , released September
       2006.



DESCRIPTION
       Recovery of supposedly erased data from magnetic media is  easier  than
       what  many  people  would  like to believe. A technique called Magnetic
       Force Microscopy (MFM) allows any moderately funded opponent to recover
       the  last  two or three layers of data written to disk; wipe repeatedly
       overwrites special patterns to the files to  be  destroyed,  using  the
       fsync()  call  and/or  the  O_SYNC  bit to force disk access. In normal
       mode, 34 patterns are used (of which 8 are random). These patterns were
       recommended   in   an  article  from  Peter  Gutmann  (pgut001@cs.auck‐
       land.ac.nz) entitled "Secure Deletion of Data from Magnetic and  Solid-
       State Memory". A quick mode allows you to use only 4 passes with random
       patterns, which is of course much less secure.


NOTE ABOUT JOURNALING FILESYSTEMS AND SOME RECOMMENDATIONS (JUNE 2004)
       Journaling filesystems (such as Ext3 or ReiserFS) are now being used by
       default  by  most Linux distributions.  No secure deletion program that
       does filesystem-level calls can sanitize  files  on  such  filesystems,
       because  sensitive  data  and  metadata  can be written to the journal,
       which cannot be readily accessed.  Per-file secure deletion  is  better
       implemented in the operating system.

       Encrypting  a  whole  partition  with cryptoloop, for example, does not
       help very much either, since there is a single key for all  the  parti‐
       tion.

       Therefore  wipe is best used to sanitize a harddisk before giving it to
       untrusted parties (i.e. sending your laptop for repair, or selling your
       disk).   Wiping  size issues have been hopefully fixed (I apologize for
       the long delay).

       Be aware that harddisks are quite intelligent beasts those days.   They
       transparently  remap  defective  blocks.   This means that the disk can
       keep  an  albeit  corrupted  (maybe  slightly)  but  inaccessible   and
       unerasable  copy  of  some of your data.  Modern disks are said to have
       about 100% transparent remapping capacity.  You  can  have  a  look  at
       recent discussions on Slashdot.

       I  hereby  speculate that harddisks can use the spare remapping area to
       secretly make copies of your data.  Rising totalitarianism  makes  this
       almost a certitude.  It is quite straightforward to implement some sim‐
       ple filtering schemes that would  copy  potentially  interesting  data.
       Better,  a  harddisk  can  probably  detect  that a given file is being
       wiped, and silently make a copy of it, while  wiping  the  original  as
       instructed.

       Recovering  such data is probably easily done with secret IDE/SCSI com‐
       mands.  My guess is that there are agreements between harddisk manufac‐
       turers  and government agencies.  Well-funded mafia hackers should then
       be able to find those secret commands too.

       Don’t trust your harddisk.  Encrypt all your data.

       Of course this shifts the trust to the computing system, the  CPU,  and
       so  on.   I  guess  there  are also "traps" in the CPU and, in fact, in
       every sufficiently advanced mass-marketed chip.   Wealthy  nations  can
       find those.  Therefore these are mainly used for criminal investigation
       and "control of public dissent".

       People should better think of their  computing  devices  as  facilities
       lended by the DHS.


IMPORTANT WARNING -- READ CAREFULLY
       The author, the maintainers or the contributors of this package can NOT
       be held responsible in any way if wipe destroys  something  you  didn’t
       want  it  to destroy.  Let’s make this very clear. I want you to assume
       that this is a nasty program that will wipe out  parts  of  your  files
       that  you  didn’t want it to wipe. So whatever happens after you launch
       wipe is your entire responsiblity.  In particular,  no  one  guarantees
       that wipe will conform to the specifications given in this manual page.

       Similarly, we cannot guarantee that wipe will actually erase  data,  or
       that  wiped  data  is not recoverable by advanced means.  So if nasties
       get your secrets because you sold a wiped harddisk to someone you don’t
       know, well, too bad for you.

       The  best way to sanitize a storage medium is to subject it to tempera‐
       tures exceeding 1500K.  As a cheap alternative, you might use  wipe  at
       your  own  risk.  Be  aware that it is very difficult to assess whether
       running wipe on a given file will actually wipe it -- it depends on  an
       awful  lot  of  factors,  such  as  :  the type of file system the file
       resides on (in particular, whether the file system is a journaling  one
       or not), the type of storage medium used, and the least significant bit
       of the phase of the moon.

       Wiping over NFS or over a journalling filesystem (ReiserFS  etc.)  will
       most probably not work.

       Therefore I strongly recommend to call wipe directly on the correspond‐
       ing block device with the  appropriate  options.  However  THIS  IS  AN
       EXTREMELY  DANGEROUS  THING TO DO.  Be sure to be sober. Give the right
       options. In particular : don’t wipe a  whole  harddisk  (eg.  wipe  -kD
       /dev/hda  is  bad) since this will destroy your master boot record. Bad
       idea. Prefer wiping partitions (eg. wipe -kD /dev/hda2) is  good,  pro‐
       vided, of course, that you have backed up all necessary data.



COMMAND-LINE OPTIONS
       -f (force; disable confirmation query)
            By  default  wipe will ask for confirmation, indicating the number
            of regular and special files and directories specified on the com‐
            mand  line.  You must type "yes" for confirmation, "no" for rejec‐
            tion. You can disable the confirmation query with the  -f  (force)
            option.


       -r (recurse into subdirectories)
            Will  allow  the  removal  of  the entire directory tree. Symbolic
            links are not followed.


       -c (chmod if necessary)
            If a file or directory to be wiped has no write  permissions  set,
            will do a chmod to set the permission.


       -i (informational, verbose mode)
            This  enables  reporting to stdout. By default all data is written
            to stderr.


       -s (silent mode)
            All messages, except the confirmation prompt and  error  messages,
            are suppressed.


       -q (quick wipe)
            If  this option is used, wipe will only make (by default) 4 passes
            on each file, writing random data. See option -Q


       -Q <number-of-passes>
            Sets the number of passes for quick wiping. Default is 4.


       -a (abort on error)
            The program will exit with EXIT_FAILURE if a  non-fatal  error  is
            encountered.


       -R (set random device OR random seed command)

            With  this  option  which  requires an argument you can specify an
            alternate /dev/random device, or a command who’s  standard  output
            will be hashed using MD5-hashed. The distinction can be made using
            the -S option.


       -S (random seed method)

            This option takes a single-character argument, which specifies how
            the  random device/random seed argument is to be used. The default
            random device is /dev/random. It can be set using the -R option.

       The possible single-character arguments are:
       r    If you want the argument to be treated like a regular file/charac‐
            ter  device.  This will work with /dev/random, and might also work
            with FIFOs and the like.
       c    If you want the argument to be executed as a command.  The  output
            from  the command will be hashed using MD5 to provide the required
            seed. See the WIPE_SEEDPIPE environment variable for more info.
       p    If you want wipe to get its seed by hashing environment variables,
            the current date and time, its process id. etc. (the random device
            argument will not be used). This is of  course  the  least  secure
            setting.

       -M (select pseudo-random number generator algorythm)

       During  the  random  passes,  wipe  overwrites  the target files with a
       stream of binary data, created by the following choice of algorythms:
       l    will use (depending on your system) your libc’s random() or rand()
            pseudorandom  generator.  Note  that  on most systems, rand() is a
            linear congruential generator, which is awfully weak.  The  choice
            is made at compile-time with the HAVE_RANDOM define (see the Make‐
            file).
       a    will use the Arcfour stream cipher as a PRNG. Arcfour  happens  to
            be  compatible  with  the  well-known  RC4 cipher. This means that
            under the same key, Arcfour generates exactly the same  stream  as
            RC4...
       r    will  use the fresh RC6 algorythm as a PRNG; RC6 is keyed with the
            128-bit seed, and then a null block is repeatedly encrypted to get
            the  pseudo-random stream.  I guess this sould be quite secure. Of
            course RC6 with 20 rounds is slower than  random();  the  compile-
            time  option  WEAK_RC6 allows you to use a 4-round version of RC6,
            which is faster. In order to be able to use RC6, wipe must be com‐
            piled with ENABLE_RC6 defined; see the Makefile for warnings about
            patent issues.

            In all cases the PRNG is seeded with the data  gathered  from  the
            random device (see -R and -S options).

       -l <length>
            As  there can be some problems in determining the actual size of a
            block device (as some devices do not even have fixed  sizes,  such
            as  floppy  disks or tapes), you might need to specify the size of
            the device by hand; <length> is the device capacity expressed as a
            number of bytes. You can use K (Kilo) to specify multiplication by
            1024, M (Mega) to specify multiplication by 1048576, G  (Giga)  to
            specify multiplication by 1073741824 and b (block) to specify mul‐
            tiplication by 512. Thus

            1024 = 2b = 1K       20K33 = 20480+33 = 20513

                                114M32K = 114*1024*1024+32*1024.

       -o <offset>
            This allows you to specify an offset inside the file or device  to
            be wiped. The syntax of <offset> is the same as for the -l option.

       -e   Use exact file size: do not round up file size  to  wipe  possible
            remaining junk on the last block.

       -Z   Don’t  try to wipe file sizes by repeatedly halving the file size.
            Note that this is only attempted on regular files so there  is  no
            use if you use wipe for cleaning a block or special device.

       -F   Don’t  try  to wipe file names. Normally, wipe tries to cover file
            names by renaming them; this does NOT guarantee that the  physical
            location holding the old file name gets overwritten.  Furthermore,
            after renaming a file, the only way to make  sure  that  the  name
            change is physically carried out is to call sync (), which flushes
            out ALL the disk caches of the system, whereas for ading and writ‐
            ing  one  can  use  the  O_SYNC bit to get synchronous I/O for one
            file. As sync () is very slow, calling sync () after every  rename
            () makes filename wiping extremely slow.

       -k   Keep files: do not unlink the files after they have been overwrit‐
            ten. Useful if you want to wipe a device, while keeping the device
            special file. This implies -F.

       -D   Dereference symlinks: by default, wipe will never follow symlinks.
            If you specify -D however, wipe will consent to,  well,  wipe  the
            targets  of  any  symlinks you might happen to name on the command
            line.  You can’t specify both -D and -r (recursive) options, first
            because  of  possible  cycles  in  the  symlink-enhanced directory
            graph, I’d have to keep track of visited files to guarantee termi‐
            nation,  which,  you’ll easily admit, is a pain in C, and, second,
            for fear of having a (surprise!!) block  device  buried  somewhere
            unexpected.

       -v   Show version information and quit.

       -h   Display help.

EXAMPLES
       wipe -rcf /home/berke/plaintext/
            Wipe  every  file  and  every  directory  (option -r) listed under
            /home/berke/plaintext/, including /home/berke/plaintext/.

            Regular files will be wiped with 34 passes and  their  sizes  will
            then  be halved a random number of times. Special files (character
            and block devices, FIFOs...)   will  not.  All  directory  entries
            (files,  special  files  and directories) will be renamed 10 times
            and then unlinked. Things with inappropriate permissions  will  be
            chmod()’ed (option -c).  All of this will happen without user con‐
            firmation (option -f).

       wipe -kq /dev/hda3
            Assuming /dev/hda3 is the block device corresponding to the  third
            partition  of  the  master  drive on the primary IDE interface, it
            will be wiped in quick mode (option  -q)  i.e.  with  four  random
            passes.   The  inode  won’t  be  renamed  or unlinked (option -k).
            Before starting, it will ask you to type ‘‘yes’’.

       wipe -kqD /dev/floppy
            Since wipe never follows symlinks unless explicitly told to do so,
            if  you  want to wipe /dev/floppy which happens to be a symlink to
            /dev/fd0u1440 you will have  to  specify  the  -D  option.  Before
            starting, it will ask you to type ‘‘yes’’.

       wipe -rfi >wipe.log /var/log/*
            Here,  wipe  will recursively (option -r) destroy everything under
            /var/log, excepting /var/log.  It  will  not  attempt  to  chmod()
            things.  It  will however be verbose (option -i). It won’t ask you
            to type ‘‘yes’’ because of the -f option.

       wipe -Kq -l 1440k /dev/fd0
            Due to various idiosyncracies of the operating  system,  it’s  not
            always  easy  to  obtain  the number of bytes a given device might
            contain (in fact, that quantity can be variable). This is why  you
            sometimes need to tell wipe the amount of bytes to destroy. That’s
            what the -l option is for. Plus, you can use b,K,M and G as multi‐
            pliers, respectively for 2^9 (512), 2^10 (1024 or a Kilo), 2^20 (a
            Mega) and 2^30 (a Giga) bytes.  You can even combine more than one
            multiplier !! So that 1M416K = 1474560 bytes.

BUGS/LIMITATIONS
       Wipe  should  work  on harddisks and floppy disks; however the internal
       cache of some harddisks might prevent the necessary writes to  be  done
       to  the  magnetic  surface. It would be funny to use it over NFS. Under
       CFS (Cryptographic File System) the fsync() call has  no  effect;  wipe
       has not much use under it anyway - use wipe directly on the correspond‐
       ing encrypted files. Also, under Linux, when  using  a  device  mounted
       thru  a  loopback  device,  synchronous  I/O  does  not  get propagated
       cleanly.

       For wiping floppy disks, at least under Linux, there is no way, besides
       obscure  floppy-driver  specific ioctl’s to determine the block size of
       the disk. In particular, the BLKGETSIZE ioctl is not implemented in the
       floppy  driver.  So,  for wiping floppies, you must specify the size of
       the floppy disk using the -l option,  as  in  the  last  example.  This
       option  is  normally not needed for other fixed block devices, like IDE
       and SCSI devices.

       File name wiping is implemented since version 0.12. I  don’t  know  how
       efficient  it  is.  It  first changes the name of the file to a random-
       generated name of same length, calls sync (), then changes the name  to
       a random-generated name of maximal length.

       File  size  wiping  is implemented by repeatedly truncating the file to
       half of its size, until it becomes empty; sync  ()  is  called  between
       such operations.

       Note that it is still not possible to file creation date and permission
       bits portably. A wipe utility working at the block device  level  could
       be written using the ext2fs library.

AUTHOR AND LICENCE
       Wipe  was  written  by Berke Durak (to find my email address, just type
       echo berke1ouvaton2org|tr 12 @.  in a shell).

       Wipe is released  under  the  conditions  of  the  GNU  General  Public
       License.

FILES
       /dev/random is used by default to seed the pseudo-random number genera‐
       tors.

ENVIRONMENT VARIABLES
       WIPE_SEEDPIPE If set, wipe will execute the  command  specified  in  it
       (using  popen()),  and will hash the command’s output with the MD5 mes‐
       sage-digest algorythm to get a 128-bit seed for its PRNG. For  example,
       on  systems lacking a /dev/random device, this variable might be set in
       /etc/profile to a shell script which contains various commands such  as
       ls,  ps,  who,  last, etc. and which are run asynchronously in order to
       get an output as less predictable as possible.

SEE ALSO
       open(2), fsync(2), sync(8), bdflush(2), update(8), random(3)



Linu                     Wed Sep 20 17:32:02 CEST 2006                 WIPE(1)

man shred:

CodeCOLON Alles auswählen

SHRED(1)                         User Commands                        SHRED(1)



NAME
       shred - overwrite a file to hide its contents, and optionally delete it

SYNOPSIS
       shred [OPTIONS] FILE [...]

DESCRIPTION
       Overwrite the specified FILE(s) repeatedly, in order to make it  harder
       for even very expensive hardware probing to recover the data.

       Mandatory  arguments  to  long  options are mandatory for short options
       too.

       -f, --force
              change permissions to allow writing if necessary

       -n, --iterations=N
              Overwrite N times instead of the default (25)

       --random-source=FILE
              get random bytes from FILE (default /dev/urandom)

       -s, --size=N
              shred this many bytes (suffixes like K, M, G accepted)

       -u, --remove
              truncate and remove file after overwriting

       -v, --verbose
              show progress

       -x, --exact
              do not round file sizes up to the next full block;

              this is the default for non-regular files

       -z, --zero
              add a final overwrite with zeros to hide shredding

       --help display this help and exit

       --version
              output version information and exit

       If FILE is -, shred standard output.

       Delete FILE(s) if --remove (-u) is specified.  The default  is  not  to
       remove  the  files because it is common to operate on device files like
       /dev/hda, and those files usually should not be removed.  When  operat‐
       ing on regular files, most people use the --remove option.

       CAUTION:  Note  that  shred relies on a very important assumption: that
       the file system overwrites data in place.  This is the traditional  way
       to  do  things, but many modern file system designs do not satisfy this
       assumption.  The following are examples of file systems on which  shred
       is not effective, or is not guaranteed to be effective in all file sys‐
       tem modes:

       * log-structured or journaled file systems, such as those supplied with
       AIX and Solaris (and JFS, ReiserFS, XFS, Ext3, etc.)

       *  file  systems  that  write  redundant data and carry on even if some
       writes fail, such as RAID-based file systems

       * file systems that make snapshots, such  as  Network  Appliance’s  NFS
       server

       * file systems that cache in temporary locations, such as NFS version 3
       clients

       * compressed file systems

       In the case of ext3 file systems, the  above  disclaimer  applies  (and
       shred  is  thus  of  limited  effectiveness) only in data=journal mode,
       which journals file data in addition to just  metadata.   In  both  the
       data=ordered  (default) and data=writeback modes, shred works as usual.
       Ext3 journaling modes can  be  changed  by  adding  the  data=something
       option  to  the  mount  options  for  a  particular  file system in the
       /etc/fstab file, as documented in the mount man page (man mount).

       In addition, file system backups and remote mirrors may contain  copies
       of the file that cannot be removed, and that will allow a shredded file
       to be recovered later.

AUTHOR
       Written by Colin Plumb.

REPORTING BUGS
       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT
       Copyright © 2008 Free Software Foundation, Inc.   License  GPLv3+:  GNU
       GPL version 3 or later <http://gnu.org/licenses/gpl.html>
       This  is  free  software:  you  are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       The full documentation for shred is maintained as a Texinfo manual.  If
       the  info  and  shred programs are properly installed at your site, the
       command

              info shred

       should give you access to the complete manual.



GNU coreutils 6.9.92.4-f088d-dirtJanuary 2008                         SHRED(1)
Nur nochmal für die, welche denken, dass neu Partitionieren und Pormatieren ausreichend ist:

Ich hab neulich auf meinem Desktop-PC Betriebssystem neu eingerichtet. Meine Festplatten bestehen aus (fast) unzähligen Partitionen. Dazu wollte ich zwei benachbarte Partitionen zu einer vereinigen und dort das Betriebssystem installieren. Erst nach der Partitionierung stellte ich fest, dass die eine dieser Parttitionen mein Home-Verzeichnis enthielt.

Sch..., alles weg, war mein erster Gedanke. Doch Pustekuchen, mit dem Progrämmchen testdisk konnte ich alles wieder herstellen. Mehr noch: Es waren Daten sichtbar (zumindest Dateinamen), welche ich schon vor Urzeiten gelöscht hatte.

Fazit: ICH geb keine Festplatte weg, bei welcher die Daten nicht sicher durch mehrmaliges Überschreiben gelöscht wurden.




VoFiWG
Meine Tipps und Hinweise gibt es unter Ausschluss jeglicher Gewährleistung aber mit ganz dollem Daumendrücken. ;)

Benutzeravatar
xManuelx
Neuling
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Re: eee Speicherkarte vollständig löschen

Beitrag von xManuelx » Sonntag 23. November 2008, 14:26

danke dür die manuals. so wies aussieht ist shred also leistungsfähiger.

mit deinen hinweisen über das löschen bzw wiederherstellen von dateien hast du absolut recht. ich hab mal versehentlich meinen ordner mit den mp3 gelöscht. aber ich konnte 90% wieder herstellen. hat mich selbst überascht.

btw für windows gibts ganz gute programme die das mehrmalige löschen draufhaben.
eraser ist ein programm was ich sehr empfehlen kann.
bei ccleaner ist eine löschroutine auch dabei

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