I was told the 3B1 label was put on 7300's that had a larger drive. The 3B2 was the larger computer - a large box really with a separate monitor, keyboard, etc. I have always called the 7300 but just that. Rob _____ From: rollei_list-bounce@xxxxxxxxxxxxx [mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf Of Don Williams Sent: Saturday, October 18, 2008 12:22 AM To: rollei_list@xxxxxxxxxxxxx Subject: [rollei_list] Re: MFM hard drives At 09:59 PM 10/17/2008, Rob wrote, in part: Actually my 3B1 (AT&T 7300 Unix PC) is new in the box - never used except to load the OS. It has all the documentation and the OS on 51/4 floppy diskettes. I used to be a dealer for the AT&T products and the only model number I remember was 3B2. What dogs, over priced, under performing, you name it and they didn't have it. I felt very lucky to sell the last one we had. Then for Unix installs we started with the NCR Towers, also dogs. Someone mentioned old style hard drives. We used to service an old Altos for a very large church and the only repair we ever did for them was to replace an external rubber drive belt. Remember the Molecular? Fine machine in it's time. Up to 16 or 32 users on one hard drive. Each user had its own 64K processor card. The 30 MB hard drive was about the same size as a VW engine. We sold a lot of medical practice management systems on Moleculars. Improve your Windows Reliability- Don't turn your computer on.