I have had no resolution of a problem I posted about earlier. From time to time, and with no apparent reason, while initialising, both True Image and Disk Director will say they are unable to read the first few sectors of both of my external drives. I click on ignore. Once fully initialised, Disk Director will show the first partitions of both disks as not being partitions at all, having no drive letters and no file system. I have no problems accessing these partitions with Explorer, and Vista's Disk Management shows these partitions to be healthy, with the NTFS file system and the correct drive letters. At this point, I have two options. I can either run the system filechecker (sfc \scannow) or I can reinstall the Acronis drivers (SnapAPI), reboot, and all is OK. True Image and Disk Director both now read all partitions correctly. But sooner or later, often within the same day, the problem recurrs. I need to know the reason this is happening. It is not a problem with the external drives or with memory. It is a problem with the Acronis applications.