You have either inserted the incorrect disk or a disk from another backup" Sage 50
Sage 50 cannot match the backup disk you inserted to the restore it started, so the restore stops until the right disk is supplied.
The message “You have either inserted the incorrect disk or a disk from another backup” appears during a multi-disk restore in Sage 50 (Peachtree in the US, Simply Accounting in Canada). Despite how it reads, it does not usually mean your disk is physically bad. It means Sage 50 is in the middle of restoring a backup set that was split across several disks, and the disk you just inserted does not match the one it expects next in the sequence.
Why it happens
When a Sage 50 backup is too large for a single disk, the program writes it as a numbered series, and the restore must read them back in exactly the same order. The check fails when the sequence is broken: a disk from a different backup set was inserted, two disks were swapped, a disk was relabeled or copied in a way that lost its position marker, or the set is genuinely incomplete because one disk was never written or was lost. It can also fire when a restore is restarted partway through and the program is expecting a later disk than the one you put in first.
Check the disk order
Take the disks out and look at their labels. A multi-disk Sage 50 backup set is normally labeled by the program with a set name and a disk number. Start the restore again from the beginning with disk one of the correct set, and insert each subsequent disk only when prompted. If two backup sets were written around the same time, it is easy to mix a disk from one into the other; that is the single most common cause of this message.
Try a different drive or copy the set to a folder
Older removable media can be read inconsistently by a worn or marginal drive, which makes a valid disk look wrong. If the disks are CDs or DVDs, try a different drive, or copy the entire set to a single folder on the hard drive and restore from that folder instead. Copying also protects the originals: if a disk is failing, you want to find that out on a copy, not during the restore itself.
If a disk is damaged or missing
If one disk of the set is scratched, unreadable, or simply gone, the restore cannot be completed from that set as-is. Do not keep retrying the same disk; repeated reads of failing media can make things worse. Check whether a more recent backup exists elsewhere, such as an online backup or a backup to a hard drive, even if it is a few days older. If the multi-disk set is the only copy of the data, it needs professional attention: our engineers work with damaged and incomplete Sage 50 backup sets and can often recover the company data from them, depending on how much of the set is intact. We offer a free evaluation of damaged Sage 50 / Simply Accounting databases so you know what is recoverable before committing to anything.
Next step
Before anything else, verify the disk numbers and restart the restore from disk one. If the set is incomplete or a disk will not read, send it for evaluation rather than experimenting further; a no-cost assessment of the backup set will tell you whether the data can be recovered and what the work would involve.