Yet another reason I hate Rev drives – had a client whose pc would blue screen when the backup would start to a rev drive. The error was bad_pool_header and fortunately I got an error in imdrvfsf.sys By downloading the software drivers from Iomega and rebooting the backups are now able to write to the disk. A quick search on google for bad_pool_header iomega shows this is a very common problem with iomega’s solution being to pay $20 for an upgrade to the software (or to just ignore the problem). Hopefully this post will help someone out but please note that this page is not the iomega support forum