Re: Wipe a drive clean
On Mon, 23 Jun 2008 14:36:35 -0600
Andrew Falanga [EMAIL PROTECTED] wrote:
I'd rather not install a port, if I can avoid it. I
Have a look at security/wipe.
Before reading this, yes I did. In fact, I even installed it.
However, the first operation appears to be a renaming of the file in
question. I was doing:
wipe -z /dev/da2
which was being kicked out with Operation not permitted. It seemed
to want to move/rename the file first. I didn't do enough digging to
get around this before reading this e-mail.
do you have access rights to write to that device?
is the device mounted ? (it shouldn't)
B
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Re: Wipe a drive clean
2008/6/23 Andrew Falanga [EMAIL PROTECTED]: On Mon, Jun 23, 2008 at 2:23 PM, Roland Smith [EMAIL PROTECTED] wrote: I'm not sure about flash memory, but for a harddrive, simple writing 0's is not a secure way to delete data. It can still be recovered. Actually, this is for an experiment that I want to start with a clean device for. I'm not actually trying to obtain some level of security. Assuming you do not have some geom provider on said device # dd if=/dev/zero of=/dev/da2 bs=1024k count=1 should wipe the partition table and superblock, which is good enough for an insecure erase. -- -- ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Wipe a drive clean
On Mon, Jun 23, 2008 at 8:03 PM, Norberto Meijome [EMAIL PROTECTED] wrote: On Mon, 23 Jun 2008 14:36:35 -0600 Andrew Falanga [EMAIL PROTECTED] wrote: I'd rather not install a port, if I can avoid it. I Have a look at security/wipe. Before reading this, yes I did. In fact, I even installed it. However, the first operation appears to be a renaming of the file in question. I was doing: wipe -z /dev/da2 which was being kicked out with Operation not permitted. It seemed to want to move/rename the file first. I didn't do enough digging to get around this before reading this e-mail. do you have access rights to write to that device? is the device mounted ? (it shouldn't) No. I unmounted before trying. Andy -- A: Because it messes up the order in which people normally read text. Q: Why is it such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
RE: Wipe a drive clean
-Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Wojciech Puchar Sent: Monday, June 23, 2008 1:40 PM To: Steve Bertrand Cc: freebsd-questions@freebsd.org; Andrew Falanga Subject: Re: Wipe a drive clean I'm having no luck finding hits for wipe drive or zero drive in the mail list archives and I can't believe I'm the first to ask this question but here it is anyway. How can I simply write 0's across a USB thumb drive? I'd rather not install a port, if I can avoid it. I was thinking that something like dd would work, but everything I've tried thus far is not working. What suggestions does everyone have? Will... dd if=/dev/zero of=/dev/disk dd if=/dev/zero of=/dev/disk bs=1m bs may be smaller but not the default 512 bytes. it's a block size. having very small block will make the process slow dd if=/dev/random of=/dev/disk bs=1024 The above will wipe the drive clean per the United States Department of Defence Standard 5220.22-M To sanitize it per the 5220.22-M stnadard, do the above 3 times. This is intended to destabilise the remnants of data that may exist on the edges of the track of the disk to which the data is written The random device is a lot slower than /dev/zero so the bs isn't as important. Ted ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Wipe a drive clean
Hi, I'm having no luck finding hits for wipe drive or zero drive in the mail list archives and I can't believe I'm the first to ask this question but here it is anyway. How can I simply write 0's across a USB thumb drive? I'd rather not install a port, if I can avoid it. I was thinking that something like dd would work, but everything I've tried thus far is not working. What suggestions does everyone have? Andy -- A: Because it messes up the order in which people normally read text. Q: Why is it such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Wipe a drive clean
Andrew Falanga wrote: Hi, I'm having no luck finding hits for wipe drive or zero drive in the mail list archives and I can't believe I'm the first to ask this question but here it is anyway. How can I simply write 0's across a USB thumb drive? I'd rather not install a port, if I can avoid it. I was thinking that something like dd would work, but everything I've tried thus far is not working. What suggestions does everyone have? Will... dd if=/dev/zero of=/dev/disk ...work? Steve ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Wipe a drive clean
On Mon, Jun 23, 2008 at 01:57:47PM -0600, Andrew Falanga wrote: Hi, I'm having no luck finding hits for wipe drive or zero drive in the mail list archives and I can't believe I'm the first to ask this question but here it is anyway. How can I simply write 0's across a USB thumb drive? I'm not sure about flash memory, but for a harddrive, simple writing 0's is not a secure way to delete data. It can still be recovered. I'd rather not install a port, if I can avoid it. I Have a look at security/wipe. was thinking that something like dd would work, but everything I've tried thus far is not working. What suggestions does everyone have? I think the trick is to use the right block size. Try bs=512 or 2048 in your dd command. Use if=/dev/random instead of if=/dev/zero and repeat a couple of times. Note that wiping flash drives way will shorten the lifespan of the device. Roland -- R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725) pgpFlUDyCpIT5.pgp Description: PGP signature
Re: Wipe a drive clean
In response to Roland Smith [EMAIL PROTECTED]: Note that wiping flash drives way will shorten the lifespan of the device. This statement is largely obsolete. Modern flash has rewrite cycles that often exceed traditional platter-based disks. -- Bill Moran http://www.potentialtech.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Wipe a drive clean
On Mon, Jun 23, 2008 at 2:23 PM, Roland Smith [EMAIL PROTECTED] wrote: I'm not sure about flash memory, but for a harddrive, simple writing 0's is not a secure way to delete data. It can still be recovered. Actually, this is for an experiment that I want to start with a clean device for. I'm not actually trying to obtain some level of security. I'd rather not install a port, if I can avoid it. I Have a look at security/wipe. Before reading this, yes I did. In fact, I even installed it. However, the first operation appears to be a renaming of the file in question. I was doing: wipe -z /dev/da2 which was being kicked out with Operation not permitted. It seemed to want to move/rename the file first. I didn't do enough digging to get around this before reading this e-mail. I think the trick is to use the right block size. Try bs=512 or 2048 in your dd command. Use if=/dev/random instead of if=/dev/zero and repeat a couple of times. Note that wiping flash drives way will shorten the lifespan of the device. The man page says that a block size of 512 is the default, though I put it on the command line anyway (talk about being paranoid). My problem was the input file. I was using /dev/null instead of /dev/zero (which I didn't know about until this e-mail). Thanks guys. Andy -- A: Because it messes up the order in which people normally read text. Q: Why is it such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Wipe a drive clean
I'm having no luck finding hits for wipe drive or zero drive in the mail list archives and I can't believe I'm the first to ask this question but here it is anyway. How can I simply write 0's across a USB thumb drive? I'd rather not install a port, if I can avoid it. I was thinking that something like dd would work, but everything I've tried thus far is not working. What suggestions does everyone have? Will... dd if=/dev/zero of=/dev/disk dd if=/dev/zero of=/dev/disk bs=1m bs may be smaller but not the default 512 bytes. it's a block size. having very small block will make the process slow ...work? Steve ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Wipe a drive clean
Wojciech Puchar wrote: I'm having no luck finding hits for wipe drive or zero drive in the mail list archives and I can't believe I'm the first to ask this question but here it is anyway. How can I simply write 0's across a USB thumb drive? I'd rather not install a port, if I can avoid it. I was thinking that something like dd would work, but everything I've tried thus far is not working. What suggestions does everyone have? Will... dd if=/dev/zero of=/dev/disk dd if=/dev/zero of=/dev/disk bs=1m bs may be smaller but not the default 512 bytes. it's a block size. having very small block will make the process slow ...work? Steve I like this tool for nuking drives: http://dban.sourceforge.net/ -- Tim Daneliuk [EMAIL PROTECTED] PGP Key: http://www.tundraware.com/PGP/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
