4th master hard disk error

All of a sudden I'm getting an error on startup:

"4th master hard disk error, press F2 to continue"

I'm currently running chkdsk but would love opinions on why this is happening all of a sudden.
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Carlos IjalbaIT Systems DirectorCommented:
I assume that you have a RAID controller with x disks attached, and that the controller is reporting a disk failure, so you should press F2, go into the controller's menu, and do a disk rebuild or a replacement, depending on the errors reported.
Chkdsk won't help, it is only good for testing file-systems, and not the disk itself. For that you would need the disk manufacturer's diagnostic utility which you can find on the UBCD provided it isn't an SSD:


But usually if the BIOS already protests, it is a SMART error, and then the diagnostic will tell you to replace the disk. So get a replacement.
hrolsonsAuthor Commented:
I have a Synology Diskstation that is attached to the network.  It's not reporting any errors.

I unplugged a secondary hard drive on the machine and the error went away.  I guess just a bad secondary hard drive.
I've requested that this question be deleted for the following reason:

Not enough information to confirm an answer.
Replacing the bad disk as I mentioned is about the same as disconnecting it, as the asker did, so my answer was correct.

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