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List:       linux-scsi
Subject:    (a bit) [OT]: reading a defective disk.
From:       R.E.Wolff () BitWizard ! nl (Rogier Wolff)
Date:       2001-05-10 12:52:50
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Hi,

I have an optical disk where the data needs to be recovered. However,
the drive tells me:

     SCSI device sda: hdwr sector= 512 bytes. Sectors= 450566 [220 MB] [0.2 GB]
     sda:scsi0: MEDIUM ERROR on channel 0, id 4, lun 0, CDB: Read (10) 00 00 00 00 00 00 00 02 00 
     [valid=0] Info fld=0x0, Current sd08:00: sense key Medium Error
     Additional sense indicates Defect list not found
     scsidisk I/O error: dev 08:00, sector 0
      unable to read partition table

So, as far as I can tell, the drive is having trouble reading the
defect list.

I'd like to bypass the defect list, and read whatever data is left of
the data-area. If the defect list is a goner, I'll have to puzzle
everything back together again myself....

Reading the SCSI spec, I found "read long", which I hoped might give
me the uncorrected raw data. However, that command is rejected with
"Illegal request".

Is there anything else that I could try?

The drive is:

     scsi singledevice 0 0 4 0
       Vendor: IOMEGA    Model: BETA230           Rev: 2.02
       Type:   Direct-Access                      ANSI SCSI revision: 02
     Detected scsi removable disk sda at scsi0, channel 0, id 4, lun 0


Thanks in advance, 

Roger. 

-- 
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 **
*-- BitWizard writes Linux device drivers for any device you may have! --*
* There are old pilots, and there are bold pilots. 
* There are also old, bald pilots. 
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