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Cannot Assign Dreive Letter To Partition Archive

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Running Acronis 2013 on Levovo T430 with Windows 7 32bit

Installed program and performed backup of OS drive (c:) and USB hard drive. Both initial incremental (full initial) backups completed successfully. I can mount the OS drive successfully, but the archive of the USB drive will not mount. Message received is: "Cannot Assign A Drive Letter To A Partition From The Backup Archive." I have deleted the 1st backup and performed a second in case something was corrupted in the 1st backup. However the second backup likewise will not mount.

USB Hard Drive is a WD 1T USB3 compatibale drive
Backup created is only 119 GB and resides on a USB2 compliant WD My Book USB hard drive.

What is the solution? I previously used Acronis 11 and had no problems mounting any images.

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You have one archive that you can mount, and one that you cannot. Are both archives stored on the same drive?

Yes. 1st archive is system partition and C drive. Both will mount. The 2nd archive is my USB hard drive. The mounting process inititates and I can hear the proces of reading the archive file. After 30 seconds reading terminates and the messate that a drive letter cannot be assigned to the archivne; no details.

I have had troubles with antivirus programs preventing the asssignment of letters--eSet Smart Security.

If you uncheck the Drive C, will the other mount as a single partition so that you are only mounting one single partition.

I completed two archives: one for the C drive and one for V:. C: of course is the main internal hard drive and this archive will mount. The second for V: is a USB hard drive. The archive for the V: partition will not mount. The two archives are separate.

The mount operation reads the archive, but after reading will return the message that a drive letter cannot be assigned.....no reason or error message returned. Does Accronis require space on the backup hard drive to mount an image? If so, must the available space need to be greater than the image file? Presently the image file is 129GB with free space only 130GB. However, this has not been a problem mounting previious Accronis images using Version 11.

Yes, Acronis can require space on the backup drive: if you mount the archive in R/W mode and make changes in the mounted image, ATI will capture the changes and create an incremental archive file. So one mounted archive + changes = 2 archives at the end.
But I doubt this is your issue since you have plenty of space left.

I think that the issue could be with TIB mounting drivers when the disk is USB. Although a bit longer, you could try to convert the archive to VHD and then attach the VHD to your logical disk manager through Windows disk management.