Franc Zabkar wrote:
May I suggest that ddrescue disable SMART by default, if it does not
already do so.
The SMART DISABLE command does not necessarily disable internal
monitoring and sector reallocation. It only disables the SMART related
ATA commands.
Also I believe that there may be ATA commands that allow retries to be
disabled at the drive level, at least in earlier versions of the
standard.
Read DMA Without Retries
Read Sectors Without Retry
Set Features Disable Retry
All the above commands were declared obsolete in ATA-5 (~2000). Do you
have any evidence that these commands are still supported by a
reasonable number of recent (ATA-8 ACS and later) drive models?
Ddrescue currently builds and works out of the box on most POSIX
platforms (including Windows thanks to Cygwin). It does not require
platform specific hacks.
Adding things like disable SMART or specific ATA READ commands would
introduce the full "there is no standard ATA/SCSI pass-through
functionality (and the existing non-standard functions do not work with
all controllers)" problem to ddrescue. This makes e.g. smartmontools
rather complex and prevents that Linux hdparm could be easily ported.
Perhaps Error Recovery Control (ERC) and the ATA Streaming feature set
might be useful in the above regard.
Try "smartctl -l scterc,R,W /dev/ice" before using ddrescue. Many recent
disks support ERC/TLER, even normal "desktop" (non-RAID) series.
Regards,
Christian
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