John Martz wrote: > On Mon, Jun 22, 2009 at 2:00 PM, Bruce > Johnson<john...@pharmacy.arizona.edu> wrote: >> No. So long as you can connect them (and both 2.5" and 3.5" drives >> require the same voltages) things should work out fine. > > I don't know how pertinent to this thread this is, but I'm not > positive they use the same voltages. > > I agree that since both 2.5" & 3.5" drives use the same connector then > the same voltages should be *supplied* to the drive. However, I don't > know how they could pull off the trick of powering a 2.5" drive from a > USB connector unless the 2.5" drives required anything other than 5v. > > I've always assumed that the 2.5" drives simply ignored the 12v power > line in the connector (and probably also the 3.3v ... as apparently > most (all?) of the 3.5" drives do in order to allow them to be powered > via a 5v & 12v 4-pin molex connector plugged into a SATA power > connector adapter). > > I hate it when manufacturers take "shortcuts" and don't fully > implement a spec. But it's a fact of life that they do this when > "everbody knows" it will work. It wouldn't surprise me at all if the > 12v (and 3.3v) pins on most laptop supplies were open.
The standard 3.5" & 5.25" drive power connector supplies +12V and +5V. 2.5" drives only need 5V so they would just use that power line. There is no 3.3V line on drive power cables. -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting "I'm a designated driver on the Information Super Highway" --~--~---------~--~----~------------~-------~--~----~ 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 g3-5-list@googlegroups.com To unsubscribe from this group, send email to g3-5-list-unsubscr...@googlegroups.com 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 -~----------~----~----~----~------~----~------~--~---
