tag:blogger.com,1999:blog-6006114617625504970.post6800155255782308888..comments2024-02-07T23:38:24.874-05:00Comments on Linux Blog: shred - Securely delete files in LinuxDevOpshttp://www.blogger.com/profile/02331067901785181627noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-6006114617625504970.post-37440582999356133282010-09-14T11:06:27.864-04:002010-09-14T11:06:27.864-04:00Shred is a useful tool if slow! For my business I ...Shred is a useful tool if slow! For my business I look for professional <a href="http://www.russellrichardson.co.uk/secure-data--media-shredding-destruction-services.aspx" rel="nofollow">Hard Drive Shredding</a> (speed and security reasons), but personally I use the function. Does anyone know the amount of times you can shred one hard drive?Rufus Colehttps://www.blogger.com/profile/02091777192492743564noreply@blogger.comtag:blogger.com,1999:blog-6006114617625504970.post-21236410014552721952010-05-03T00:16:06.866-04:002010-05-03T00:16:06.866-04:00The explanation for the slowness is on the first p...The explanation for the slowness is on the first page of the manual...<br />-snip-<br /> --random-source=FILE<br /> get random bytes from FILE (default /dev/urandom)<br />-snip-<br />/dev/urandom is not made to provide the industrial quantities of random data needed for erasing a whole hard drive. The algorithm behind it produces a relatively good quality of randomness, at the expense of being CPU intensive. The differences in speed you guys are seeing probably reflect differences in processor power, since that's the bottleneck.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6006114617625504970.post-24163368044622369032010-04-30T02:55:53.836-04:002010-04-30T02:55:53.836-04:00Interesting - 3% done after > 12hrs!
I started...Interesting - 3% done after > 12hrs!<br /><br />I started a shred of my external 500GB and after ~3.5hrs, I'm at:<br />shred: /dev/sdb: pass 1/2 (random)...310GiB/466GiB 66%<br /><br />If you started shred with no arguments, and you are using an older version, it might be doing 25 random cycles per sector! Bummer!<br /><br />I started mine with the following command line:<br />shred -n 1 -v -z /dev/sdb<br /><br />(where /dev/sdb is my external drive)<br /><br />Cheers,<br />tkb.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6006114617625504970.post-48071767481455600772010-04-13T08:03:39.331-04:002010-04-13T08:03:39.331-04:00I just want to know why shred is so damn slow. I ...I just want to know why shred is so damn slow. I started a 500GB hard drive yesterday (early) afternoon and the morning of the next day it's showing 3% done of the 1st pass. That's a pretty useless tool if you ask me.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6006114617625504970.post-68192503498926323352010-01-25T17:59:04.623-05:002010-01-25T17:59:04.623-05:00Shred is a nice tool. However, it's quite lim...Shred is a nice tool. However, it's quite limited. If you read the shred man page, you'll see that it's inefective on, e.g., journaled filesystems and RAID-based filesystems.Anonymousnoreply@blogger.com