Report 4.0 and errors 206 and 105 in Device and Hardware Compatibility Pre OS X Posted November 6, 2008 Update: I removed the casing of the DAT drive and shook the drive. A big clump of rusty fibers fell out. I put the housing back on and attached a new terminator. Now the DAT drive works most of the time. It has some problems with one of the DDS cartridges. Perhaps that cartridge is getting old. I'm still having, though, the same problem with the external HD. Each time Retrospect creates a bad header at 8898 or 8899. It won't back up at all. Disk First Aid reports no problems with the HD, and otherwise I don't have any problems with the HD. It works normally. I have tried using the external HD with just the scanner (and terminator) and just the DAT drive with the scanner (and terminator.) I to leave the scanner plugged in, because it's a 25-pin SCSI device, and I have only the 50-pin terminator. This set-up does not improve Retrospect's ability to use the external HD.