topic Re: Connecting Fast Wide Differential Disks to LVD adapters ? in Disk

Connecting Fast Wide Differential Disks to LVD adapters ?

Ron Barak — Mon, 20 May 2002 18:20:29 GMT

Hi Guys,
General question: can Fast Wide Differential Disks (e.g., from J210) be
connected to LVD adapters (e.g., on 785 class machines) ?
Thanks,
Ron.

Re: Connecting Fast Wide Differential Disks to LVD adapters ?

A. Clay Stephenson — Mon, 20 May 2002 18:23:14 GMT

Absolutely, positively NO!! They are not compatible. You can use an HVD/LVD SCSI bus convertor. One source is Blackbox Corp.
http://www.blackbox.com/

Re: Connecting Fast Wide Differential Disks to LVD adapters ?

Helen French — Mon, 20 May 2002 18:27:02 GMT

Hi Ron:

NO ! You could connect the SE disks with LVD adapters. The standards are different in LVD and fastwide.

HTH,
Shiju

Re: Connecting Fast Wide Differential Disks to LVD adapters ?

Bill Hassell — Mon, 20 May 2002 22:45:35 GMT

Although most versions of SCSI (SE, Fast, Wide, LVD, Ultra, etc) are compatible with just a cable change, Fast Wide Differential used by HP is known as High Voltage Fast Wide Differential. HP was one of the first adopters for this state of the art interface. Even today, it works with the longest SCSI cables available (80 feet!)

However, that long distance and speed (faster than previous versions) came at a price: no compatibility. The voltages and pins must be electrically translated back to other versions of SCSI.