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External drive letter changed now Acronis cannot find image backup

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I installed an additional optical drive and the drive letter on the external drive changed from G: to H: now when I tried to restore an image Acronis reports it cannot find it!

How do I change the drive letter on the Acronis interface from G: to H: to find the backup image?

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Scopio, if Acronis is telling you that it cannot find your backup image when doing a restore, then this suggests that you are attempting the restore from within Windows instead of doing this by using the Acronis bootable Rescue Media (which is recommended).

Personally, I would suggest going in to Windows Disk Management and changing the drive letter for your additional optical drive so that it no longer is claiming the G: drive, then set your external drive back to be G:

The reason for this error is simply that Acronis records information about the backup task and backup drive in its internal database and when you attempt either to backup or restore within Windows, it references that information in the database and finds a mismatch with your changed drive letter.  When you use the Rescue Media, then the database is not used so it doesn't care where the backup file is stored - you just point it at the drive that holds it.

As Steve says, you should assign a fixed drive letter to your external drive. Choose a letter high in the alphabet (e.g. M) to avoid its letter changing when other drives are connected.
Windows Disk Management | right-click the external drive | Change drive letters and paths.

While there, you should also add a recognizable label to every partition, so you can uniquely identify them without the drive letter.

And, to reinforce what Steve says, you should not restore disks or partitions from the Windows application. Do it after booting from the ATI Rescue Media.

In reply to by truwrikodrorow…

Along these same lines, but without changing the drive letter:

Just last night, I found that when I changed the connection on my backup drive from USB to eSATA, without changing the drive letter (The drive ID as displayed by MOUNTVOL did not change), my nightly backup failed to find it. 

Oddly, when I went to "change destination" on the Backup page of the TI program, it immediately selected the proper drive and the target directory.

Apparently, the GUI front end knows how to find the drive better than the internal backup routines.