#Cloning drive failure with dd

41 messages · Page 1 of 1 (latest)

fathom light
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Even if a single block is bad dd usually bails out

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Does your disk have SMART like any modern disk should?

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The SSD doesn't matter

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The error is happening on /dev/sdc

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And that's input

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I've seen disks that work perfectly fine yet when you try to move files off them they bail out

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Thankfully on that disk the bad sector happened to be in the middle of an unimportant VM disk image

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That doesn't usually cause IO errors

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I need to see the various error counts

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Stuff like "Offline_Uncorrectable"

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sudo smartctl -a /dev/sdc

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What you're describing looks like a very classical "unreadable sector fucking up a whole disk copy" issue

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Yes, your disk may work fine

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But any disk develops issues from time to time

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And those issues may corrupt some unimportant files such as an obscure manpage you never use

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Thus you just never know that something got corrupted

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Your Current_Pending_Sector is 10

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That means 10 sectors out of your 1 terabyte are bad and one of them is most likely causing your issue

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Try to find a different disk cloning tool, dd doesn't support skipping one sector in the middle of other sectors

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SMART will try to get the data off it, copy it to a good sector and disable the bad sector but it can't do that if it can't read the sector at least once

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Currently they're still pending and that means Linux can still try to access them

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dd is hitting one of those 10 and thus bailing out

weak axleBOT
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vlad557776 received a thank you cookie!

fathom light
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I didn't really have a hard drive failure in quite a while so I never needed to do stuff like this, sorry

weak axleBOT
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You're thanking too much ó_ò

fathom light
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Unreadable sectors are not in any way related to encryption

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Unreadable sectors are just something an HDD develops over time

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I don't use dd a lot so I don't really know, sorry

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IIRC block size is something that mostly mattered in the old days

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I'd use what the hardware reports

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But most stuff that's dividable by the actual block size should work

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Block size mattered with stuff like tapes and floppies with Unix FSes

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It has mostly been standardized and irrelevant since mainframe days

limpid sparrow
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how about using clonezilla to clone?

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... clonezilla

plucky flickerBOT
limpid sparrow
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Hirens boot CD has tools for damaged drives, also parted magic

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And iirc clonezilla also has options to skip bad sectors

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Use the advanced settings

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Did you even did what clonezilla is literally yelling at you?