In a message dated 6/21/03 10:45:46 AM, [EMAIL PROTECTED] writes: << Your basic, run-of-the-mill 50-pin SCSI hard drive (like Quantum, Seagate, etc.); how fast does the disk spin? >>
5400 rpm for 3.5" drives, 3600 rpm for 5.25" drives. >> On the 68-pin and 80-pin SCSis, I always see the speed rating (7200rpm, 10,000rpm). So what is the "standard" speed for HDs? >> Actually, "standard" is 3600 rpm, and has been since IBM invented the hard drive nearly 50 years ago. The reason is a simple one ... the early hard drives had an ac motor to drive the spindle, and a two-pole ac motor's sychronous speed is 3600 rpm. Even IBM's first two generations of dc driven spindles were 3600 rpm. 5400 rpm is about the slowest that a 3.5" UW-SCSI drive was made; 3600 rpm for a 5.25" UW-SCSI drive. Seagate's Barracuda (ca. 1995) pushed the spindle speed to 7200 rpm, for any interface, even N-SCSI. Then 10,000 rpm for the Cheetah. And now 15,000 rpm. -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Sonnet & PowerLogix Upgrades - start at $169 | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> PCI-PowerMacs list info: <http://lowendmac.com/lists/pci-powermacs.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/pci-powermacs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
