At 08:21 PM 4/12/00 -0500, you wrote: A Shugart 800/801 is single sided. The Shugart 850/851 is double sided. -jim --- jimw(a)computergarage.org The Computer Garage - http://www.computergarage.org Computer Garage Fax - (503) 646-0174

As others have already said, it's SSDD. The -2 designation refers to the jumpering, which, in this case, is set up for use in an intelligent controller setting (normally with a dedicated microcontroller) that has the ability to exploit the various radial access options provided on the drives' logic boards. These enable such things as radial step, radial select, radial ready, (enabling more than one drive to accept/execute commands at a time). These can speed up disk drive operation by quite a little, but at the cost of a dedicated intelligence or, perhaps, LOTS of code to optimize the process as it would be in a dedicated controller. When it comes down to transfer of data, only one drive can be "awake" at a time. Dick ----- Original Message ----- From: Lawrence LeMay <lemay(a)cs.umn.edu> To: <classiccmp(a)classiccmp.org> Sent: Wednesday, April 12, 2000 7:21 PM Subject: Shugart 800-2 Shugart