> > 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.
True. > > 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. And there was 5.25" HDs that spun at 5400rpm. I have three of those FH size, two 1GB and 2.1GB. Also scsi drives 3.5" did spin at 3600rpm like seagate ST296N etc. > Seagate's Barracuda (ca. 1995) pushed the spindle speed to 7200 rpm, for any > interface, even N-SCSI. Hot, hot bricks and still slooow and big racket. 1GB had about 10 platters of about 100mb each, Barrcuda 2.1GB has 210MB platters which I have one and is still slow. Even an 5400rpm IBM 1 platter 540MB scsi kicked that for similar speeds and cool running and I happen to have one too. Only thing that first barracudas is great was best seek times for that time back then but the STR performance stinks. > Then 10,000 rpm for the Cheetah. On smaller platters diameter and less capacity. > And now 15,000 rpm. Even smaller platters, almost like laptop platters but they run like wicked and latest generations are not so hot and quiet compareable to consumer HDs for noise. Cheers, Wizard -- 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
