Skip to content

Month: July 2015

Rebuilding the Windows System Reserved Partition

I’ve been googling this like crazy for the past couple of days to find out how rebuild a Windows 7 System Reserved partition. So lets start with the back story of why I needed to do this.

A few weeks ago I upgraded my Samsung 840 EVO to a new 850 EVO, and installed the 840 EVO in another computer here. In both cases I used Samsung’s Migration Tool to copy the old drives to the new drives. In both cases, at least so far as I can tell, Samsung’s tool renamed the 100MB System Reserved partition to “Data” and filled it until it had 5MB free. For whatever reason, the file filling the partition is completely invisible.

The problem with this problem, is that while the system works just fine, if you use Window’s image backup utilities (wbadmin), for a drive that’s smaller than 500MB, there must be at least 50MB free. Well in the default configuration from a Windows install, there’s about 70MB free and everything backs up just fine. However, with only 5 MB free, the volume shadow copy can’t be made, and the backup will error out. Backups failing was the symptom that clued me in that the system reserved partition was messed up again.

In any event, I’ve tried a couple of ways to recover this situation without resorting to the most oft given advice of format and reinstall—advice I find simply appalling in almost every situation that it’s given. The first time I had this problem, I just repartitioned the disk so that I had more space on the system reserved partition so it would back up—it also helped that I needed >300MB since I was going to try and convert the computer to boot off UEFI instead of the legacy BIOS.