Hello Oleg,
Oleg Krutov wrote:
Is it physically possible to read data from SAS/SCSI drives that have more
than 512 (usually -- 520) bytes per sector? These drives are not properly
detected by kernel ("Unsupported sector size 520. 0 512-byte logical
blocks"), so it can be read only via sg_raw utility by direct scsi
commands, by little chunks and very slowly. Maybe there is an opportunity
to read a drive "more directly" than with O_DIRECT flag?
Mi intention has been always to keep ddrescue simple, so I do not plan
to implement complicated workarounds to access drives not supported by
the kernel. IMHO hardware access belongs in the kernel. Maybe ddrescue
can be compiled on a system whose kernel (not linux) supports 520-byte
sectors?
Scott Dwyer wrote:
But did everyone forget my older passthrough patches for ddrescue?
They are still available in the downloads section for ddrutiltiy on
sourceforge. A smart person could possibly hack the patch and
potentially make a version of ddrescue that could read those drives.
Not an easy task, but possible.
I have not forgotten your patch, but I am reluctant to spend time
implementing non-standard things, given the amount of more useful things
I have to do. :-)
Best regards,
Antonio.
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