On 05/15/2014 05:48 PM, Cory Smelosky wrote: I need the /physical/ drive size! Different systems give me different sizes. This, of course, should not happen. The host should query the drive for its size, in blocks...I don't know why a given host OS would give you different numbers. It is listed as 2G...the MicroVAX 3100 I wrote it with claims it's ~570M If it's an early MicroVAX-3100, and you're frobbing that drive via its ROM-based monitor, that code is limited to 21-bit block numbers. Later machines use 32-bit block numbers. -Dave -- Dave McGuire, AK4HZ New Kensington, PA