On Oct 23, 2008, at 2:46 PM, Dan wrote:
> Not sure why I thought it was a stepper motor. Steppers were used in the first generation MFM and SCSI drives (ST-225, for example), but most second generation and all third generation adopted stepless "voice-coil" motors. Once IBM proved the so-called "ID-less" technology, there wasn't even an ID field on the functional surface ... it was maintained in a EEROM on the drive's analog/digital board. Current drives employ super sophisticated DSPs to recover the data, using exceptionally advanced encoding, and the "spare cycles" of the DSP itself are used to control the spindle motor and the voice-coil "motor". --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed Low End Mac's G3-5 List, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/g3-5-list?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
