Are SMART errors "Ultra DMA CRC Error Count" automatically correctedby Windows 7 (64 bits edition) ?

[guilbert.stabilo]

Hi everybody,

Under Windows 7, I moved a lot of files from my disk to an external hard disk connected to my computer with a eSATA interface.
After all my files were moved, I opened HDTune which reported me 2 CRC errors which were not here before the copy.
As suggested by HDTune, I changed the eSATA cable, did another copy and never had the CRC errors again.
I can deduce that my first cable was faulty.

Do you know if Windows 7 corrected the errors by trying to move the files or blocks again after the error was reported to the system or are my files irreversibly corrupted ?

Thanks in advance for helping.

 

[Rod Speed]

Hi everybody,

Under Windows 7, I moved a lot of files from my disk to an external hard
disk connected to my computer with a eSATA interface.
After all my files were moved, I opened HDTune which reported me 2 CRC
errors which were not here before the copy.
As suggested by HDTune, I changed the eSATA cable, did another copy and
never had the CRC errors again.
I can deduce that my first cable was faulty.

Do you know if Windows 7 corrected the errors

Yes it did.

by trying to move the files or blocks again
after the error was reported to the system

Yes it did, at the block level.

or are my files irreversibly corrupted ?

Nope.

 

[Arno]

Hi everybody,

Under Windows 7, I moved a lot of files from my disk to an external hard disk connected to my computer with a eSATA interface.
After all my files were moved, I opened HDTune which reported me 2 CRC errors which were not here before the copy.
As suggested by HDTune, I changed the eSATA cable, did another copy and never had the CRC errors again.
I can deduce that my first cable was faulty.

Do you know if Windows 7 corrected the errors by trying to move the files
or blocks again after the error was reported to the system or are my files
irreversibly corrupted ?

Theae are not errors in stored data. These are command transmission
errors. They get fixed by retries as the original commands with
the defective CRC will not be executed by the disk.

So do not worry. However, when copying large amounts of data,
a full compare or at least a compare-by-hash is highly advisable
as data can get corrupted in a lot of other places during such
transfers.

Arno

 

[Yousuf Khan]

Hi everybody,

Under Windows 7, I moved a lot of files from my disk to an external
hard disk connected to my computer with a eSATA interface. After all
my files were moved, I opened HDTune which reported me 2 CRC errors
which were not here before the copy. As suggested by HDTune, I
changed the eSATA cable, did another copy and never had the CRC
errors again. I can deduce that my first cable was faulty.

2 CRC errors is hardly anything, I'd say that your first cable is
perfectly fine. I've seen situations where there are 10's of thousands
of CRC errors, that's definitely a faulty cable.

Do you know if Windows 7 corrected the errors by trying to move the
files or blocks again after the error was reported to the system or
are my files irreversibly corrupted ?

No, the CRC errors are the fixable errors. Fixable errors are those
where you don't lose any data. There's another SMART field, known as
offline uncorrectable sectors, which are unfixable, meaning you lose data.


Yousuf Khan