How to calculate disk space requirements when performing restores with System Recovery.
Article ID: 100015861
Updated On:
Description
Error Message
The following error may be seen if the target disk does not have enough space for the restore:EC950006: Destination drive is not valid
Resolution
Article provided as information only.
Issue/Introduction
When performing restores with System Recovery, the following calculation can be used to understand the minimum disk space required for a successful restore.
Total size of the source volume divided by 16 + the total used space on the source volume.
Example:
Source volume total size = 60GB
Total used space on source volume = 20GB
Calculation: 60/16 = 3.75 + 20 = 23.75GB
Note: The pagefile size is also a consideration. If the source volume contains a pagefile, you should also allow a 'buffer' on the target disk to allow for this. A 4GB buffer is recommended (so above example would be 23.75 + 4 = 27.75GB).
Total size of the source volume divided by 16 + the total used space on the source volume.
Example:
Source volume total size = 60GB
Total used space on source volume = 20GB
Calculation: 60/16 = 3.75 + 20 = 23.75GB
Note: The pagefile size is also a consideration. If the source volume contains a pagefile, you should also allow a 'buffer' on the target disk to allow for this. A 4GB buffer is recommended (so above example would be 23.75 + 4 = 27.75GB).
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