Microsoft KB Archive/314686

= ASR Cannot Restore System Disk to Replacement Disk of Identical Size =

Article ID: 314686

Article Last Modified on 3/2/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Standard x64 Edition
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise x64 Edition
 * Microsoft Windows Server 2003, 64-Bit Datacenter Edition

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This article was previously published under Q314686



SYMPTOMS
When you attempt to use Automated System Recovery (ASR) to restore to a replacement system or disk, you may receive the following error message, even if the new system disk appears to be the same size as the original system disk:

Setup was unable to restore the configuration of your system

because of the following error:

The capacity of the current system disk drive is

insufficient, and cannot be used to recover the

partitions on the original system disk.

The replacement hard disk drives must be at least as large

as the disks present on the original system.



CAUSE
This behavior can occur if the replacement disk is slightly smaller than the original system disk, even though they are shown as having the same amount of space. This can occur because two disks that appear to be of the same size may not have the same number of sectors, due to differences in disk geometry and rounding errors in the display of disk space.



RESOLUTION
To resolve this behavior, use a replacement disk that has identical disk geometry to the original disk, or use a larger disk.



STATUS
This behavior is by design.



MORE INFORMATION
Slight differences in the number of available sectors on a disk may also occur between disks that are the same make and model, but which have different firmware revisions.

Keywords: kbprb KB314686

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