Re: I'd like to fix read failure issue on Mac OS X
Kimio Miyamura <[email protected]>
| Newsgroups | gmane.linux.utilities.smartmontools |
|---|---|
| Message-ID | <[email protected]> |
2014/12/17 18:49, Tim Small <tim <at> seoss.co.uk> wrote:
> If there's doubt about what the actual LBA is, then to be on the safe
> side, I would try and use dd to read the entire disk:
>
> dd if=/dev/disk5 of=/dev/null bs=512
>
> on Linux I'd also use iflag=direct to stop any OS level buffering, but
> don't know how this is done (if at all) on OSX.
>
> You will then confirm where (if anywhere user-addressable) the error
> actually is.
>
> Reconfirm using
>
> dd if=/dev/disk5 of=/dev/null bs=512 skip=suspectedLBA count=1
>
> (again adding option for direct I/O if possible).
>
>
>
> I'd then use dd with bs=512 if=/dev/zero count=1 seek=suspectedLBA to
> write to the correct disk device, and then confirm pending sector = 0 in
> smartctl output.
Sorry, I don't try this procedure yet...
> If you can't find the sector, then maybe the drive is using something
> like DCO. In that case maybe best to use a Linux boot disk (something
> like GRML, which includes smartctl and hdparm) to proceed with minimal
> risk to your OS install.
I tried GRML live cd. But may be something is wrong, I can't fix with hdparm or dd on live cd.
Here's fdisk result on live cd.
$ fdisk -ul /dev/sdb
Start End Sectors Size Type
/dev/sdb1 40 409639 40960 200M EFI
/dev/sdb2 409640 976510983 976101344 465.5G Apple HFS/HFS+
So end sector of /dev/sdb2 976510983 < short test result 976783240...
I don't know why...
// Miya
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