Recovering data from duff CDROM ?
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From: Vahis on 2 Nov 2009 13:24 On 2009-11-02, Mike Jones <Not(a)Arizona.Bay> wrote: > > Update: Just tried mount -t iso9660 /dev/sr0 /home/user/temp > > and got 'mount: /dev/sr0: can't read superblock' as the error. A broken disk can hardly be mounted. It must be read on device level, unmounted. > > This is a different error to the others, so maybe the superblock is > barfed on the cdrom disk? If so, maybe its beyond recovery? > > Its a read:write disk, so there may be a trick yet? > I recommend ddrescue warmly. Vahis -- "Sunrise 7:48am (EET), sunset 4:18pm (EET) at Espoo, Finland (8:30 hours daylight)" http://waxborg.servepics.com Linux 2.6.25.20-0.5-default #1 SMP 2009-08-14 01:48:11 +0200 x86_64 8:22pm up 3 days 1:23, 11 users, load average: 0.14, 0.17, 0.16
From: philo on 2 Nov 2009 14:01 Mike Jones wrote: > Responding to philo: > >> Mike Jones wrote: >>> I burned a CDROM a short while back, and now can't get the damn thing >>> to mount (even though it would have been checked as OK prior to >>> storage). As its got data on it that is no longer available from >>> source, I'm wondering if anybody has any favorite tricks they've used >>> to force a mount. >>> >>> Its a cheapo Memorex thing from some supermarket, and the data was >>> originally on an ext2 file system. The data is a collection of MP3 >>> lectures, and was burned as data (not as an audioCD) to this CDROM >>> using Brasero on a Zenwalk-5.2 OS. >>> >>> I've tried the usual "auto" and "ext2" mount options, and the "-s" >>> sloppy mount flag, but the best I can manage is a lot of disk spinning, >>> followed by a report that the resource is read only (its not) and a >>> mount screen report about "No such file or directory" available. >>> >>> Just to be sure I'd actually managed a burn in the first place, I >>> dropped the disk into a burn process in XFburn (the app I'm currently >>> using on Slackware) and, as expected, got a report that the CDROM disk >>> was full. >>> >>> There is no visible evidence of damage on the disk itself. Its shiney >>> new. >>> >>> I'm open to suggestions about now. Clues anyone? >>> >>> >> >> try it on another machine > > > Done that already. > > there's a windows utility call iso buster that I've used with good results. don't know if there is a Linux equiv
From: Rikishi42 on 2 Nov 2009 16:30 On 2009-11-02, Mike Jones <Not(a)Arizona.Bay> wrote: > I burned a CDROM a short while back, and now can't get the damn thing to > mount (even though it would have been checked as OK prior to storage). As > its got data on it that is no longer available from source, I'm wondering > if anybody has any favorite tricks they've used to force a mount. Once recovered one by forcing the drive to read it at a slow rate (1x speed or 2x speed). If I'm not mistaken, I did that by using hdparm: hdparm -E 2 /dev/cdrom Mind that you try your reading on a CD-ROM drive, not a DVD drive. Unless it was burned on a DVD burner, in which case you use that one. Min CD-ROM speed for a DVD device is 8x, of course. Good luck. -- Any time things appear to be going better, you have overlooked something.
From: Mike Jones on 2 Nov 2009 17:55 Responding to Rikishi42: > On 2009-11-02, Mike Jones <Not(a)Arizona.Bay> wrote: > >> I burned a CDROM a short while back, and now can't get the damn thing >> to mount (even though it would have been checked as OK prior to >> storage). As its got data on it that is no longer available from >> source, I'm wondering if anybody has any favorite tricks they've used >> to force a mount. > > Once recovered one by forcing the drive to read it at a slow rate (1x > speed or 2x speed). > > If I'm not mistaken, I did that by using hdparm: > > hdparm -E 2 /dev/cdrom > > Mind that you try your reading on a CD-ROM drive, not a DVD drive. > Unless it was burned on a DVD burner, in which case you use that one. > > Min CD-ROM speed for a DVD device is 8x, of course. > > > Good luck. Hmmm. Interesting ideas there. I shall investigate. Thanks. -- *===( http://www.400monkeys.com/God/ *===( http://principiadiscordia.com/ *===( http://www.slackware.com/
From: Mike Jones on 2 Nov 2009 17:56
Responding to philo: > Mike Jones wrote: >> Responding to philo: >> >>> Mike Jones wrote: >>>> I burned a CDROM a short while back, and now can't get the damn thing >>>> to mount (even though it would have been checked as OK prior to >>>> storage). As its got data on it that is no longer available from >>>> source, I'm wondering if anybody has any favorite tricks they've used >>>> to force a mount. >>>> >>>> Its a cheapo Memorex thing from some supermarket, and the data was >>>> originally on an ext2 file system. The data is a collection of MP3 >>>> lectures, and was burned as data (not as an audioCD) to this CDROM >>>> using Brasero on a Zenwalk-5.2 OS. >>>> >>>> I've tried the usual "auto" and "ext2" mount options, and the "-s" >>>> sloppy mount flag, but the best I can manage is a lot of disk >>>> spinning, followed by a report that the resource is read only (its >>>> not) and a mount screen report about "No such file or directory" >>>> available. >>>> >>>> Just to be sure I'd actually managed a burn in the first place, I >>>> dropped the disk into a burn process in XFburn (the app I'm currently >>>> using on Slackware) and, as expected, got a report that the CDROM >>>> disk was full. >>>> >>>> There is no visible evidence of damage on the disk itself. Its shiney >>>> new. >>>> >>>> I'm open to suggestions about now. Clues anyone? >>>> >>>> >>>> >>> try it on another machine >> >> >> Done that already. >> >> >> > > > there's a windows utility call iso buster that I've used with good > results. don't know if there is a Linux equiv Doubtless. It might be a combination of things called in one commandline though. I guess I'm going to end up learning it. ;\ -- *===( http://www.400monkeys.com/God/ *===( http://principiadiscordia.com/ *===( http://www.slackware.com/ |