Techweb heeft een artikel gepost over de verkrachting van de SCSI standaarden door het toevoeging van allerlei eigenhandige tweaks. IBM kwam bijv. met Ultra160+ en 'packetization', Seagate bedacht een feature genaamd 'fairness' en Quantum voegde de 'Asynchronous Information Protection Feature' toe:
Under a loosely worded SCSI interface standard, a number of disk drive suppliers are shipping incompatible productsthat even industry executives are grumbling about.
On the surface, it's simple: The 16-bit Ultra3 SCSI specification allows data to be transferred at 160 megabytes per second using double-clocking. But delve into the specification, and things get a little murkier. Suppliers have the option of choosing one or a number of performance enhancements, and the result has been a crazy quilt of incompatibility.
[...] At I/O supplier Adaptec, however, dealing with the interface changes is a headache the company is familiar with, said Mark Delsman, director of advanced technology at the Milpitas, Calif., company and a member of the STA board of directors. Revisions to the Ultra160 specification such as IBM's Ultra160+ require a silicon redesign, although Delsman said both the UltraStar 72ZX and the corresponding silicon will be available when the drive ships in the first half of 2000.
According to Delsman, the features promoted in the Ultra3 specification all enhance performance, and he said he expects all of the features will be included in the 320-Mbyte/s Ultra320 spec, which was being ratified last week in Monterey, Calif. The final spec should be in place by March or April, and samples will likely be shown at Comdex in 2000, with production slated for early 2001
Check Techweb voor het complete artikel.