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Re: [Bug-ddrescue] SMART, reallocation, and retries


From: Franc Zabkar
Subject: Re: [Bug-ddrescue] SMART, reallocation, and retries
Date: Sun, 18 Aug 2013 07:25:17 +1000

Thank you for the extensive explanation.

I have always been aware that they are several levels of abstraction between the hardware and the application software, but I was not aware of the philosophy behind the design of ddrescue, particularly in respect of the stringent requirement for portability between dissimilar platforms. That said, I would have thought that the subject ATA commands would have been supported at least in earlier times. In any case, it does appear that modern drives do not permit external control over their retry behaviour, at least not via standard ATA commands. No doubt they have vendor specific commands that achieve this end -- that's how commercial hardware based imagers appear to work. In fact these can image a drive at the physical CHS level, and they are also able to switch off a bad head and image the remainder. Clearly that's not possible with an ATA tool.

Sorry for my ignorance, and yes, I do understand the distinction. :-)

-Franc




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