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On my Windows 8 machine, I have set up backup to a network location on my new NAS (a Synology DS412+).

Backup has succeeded. But in the "Windows 7 File Recovery" section of the Control Panel it says "The disk that your backup is saved on is about to fail":

The disk that your backup is saved on is about to fail

But I have no other indication that the NAS is about to fail. Logging into the NAS, it reports that the "DiskStation is working well". The NAS is configured with RAID 6. SMART reports no errors whatsoever on any of the four disks. I have used the NAS extensively for several weeks with no issues at all.

Windows event logs of the backup show no warnings or errors.

What exactly is the basis for Windows's diagnose that the disk is "about to fail"? What has it detected?

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my hunch is it says that because it cannot read the smart stats on the drive. if smart is good, then your disk probably is as well, at least physically, but a chkdsk would probably be a good idea. I'm seeing other people having this issue with external drives exclusively, so I'm inclined to believe it is a false positive. – Frank Thomas Dec 4 '12 at 20:46
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My hunch is also that it is a false positive, but I would still like to know how Windows arrived at the conclusion that the drive is about to fail. What does it detect? – Klas Mellbourn Dec 5 '12 at 6:41

2 Answers

up vote 3 down vote

Seems likely that it is a bug in windows or it isn't able to read the SMART values properly (more than likely a bug). However there is a third possibility.

Are you looking looking for errors in the SMART error log or have you looked at all the attributes for the drives? It is possible to have a reallocated sector count or other SMART attribute show some warning signs by having a certain value, however until it hits the threshold level then it will not report an error in the error log.

It could possibly be that windows is looking at the SMART values directly and applying its own threshold or other logic/algorithm to it. I think its likely a bug however. You could check however looking at the attributes directly themselves for each drive - if you haven't done so already - rather than just the error log.

For example my drive right now. I'm using GSmartControl - a GUI version of smartmontools:

Raw value Reallocated sector count 1

Error log shows no errors as it has not reached the threshold of 5

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+1 just for mentioning GSmartControl. Looks awesome. – Mehrdad Dec 9 '12 at 1:51
I have looked at the SMART raw data. Both Reallocated_Sector_Ct and Reallocated_Event_Count is zero for all four disks (as is all Error Rate and Error Count values). – Klas Mellbourn Dec 9 '12 at 9:21
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Delete your Windows 7 backups and the message will go away, it's the backup that is going to fail, not the drive.

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source? explanation? – Nifle Jan 19 at 21:22

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