osborn@ux1.lbl.gov (James R Osborn) (05/16/91)
I *AM* going to install a Quantum LPS-52 SCSI drive inside my Mac+. The drive says 6 watts. It is a low profile, low power consumption drive. My question is do I really have to spend $50 for a seperate 20 watt power supply for the drive? Or if I upgrade my Mac+ power supply (install new various components as per Larry Pina's "Macintosh Repair Secrets..." suggestions), and adjust the voltages with the drive installed, will *THIS* work? Just what are the Mac+'s power supply ratings? Someone told me that if I install a drive like this, there is a significant drain particularly on startup. The drain, so I was told, is enough to possibly cause the drive to trash itself during startup. I don't want this! :^o What do people think? -- James |-----------------------------------------------------------------------| | James R. Osborn | It just goes to show you it's always | | Lawrence Berkeley Laboratory | something. Either it's incorrect tech | | osborn@ux1.lbl.gov | notes or your mac is smoking. It's | | (415) 548-8464 | always something... | |-----------------------------------------------------------------------|
stanfiel@testeng1.misemi (Chris Stanfield) (05/17/91)
In article <13260@dog.ee.lbl.gov> osborn@ux1.lbl.gov (James R Osborn) writes: > >I *AM* going to install a Quantum LPS-52 SCSI drive >inside my Mac+. The drive says 6 watts. It is a low >profile, low power consumption drive. My question is >do I really have to spend $50 for a seperate 20 watt >power supply for the drive? The Mac+ supply is flakey - it is a very marginal design. I would install the extra supply AND A FAN!!! A SCSI drive typically draws >2A at 12V on startup, but typically uses only 0.5A at 12V when running. The 5V drain is ~0.5A, so your low poer unit probably does all it says, but it still may draw a lot of power on power-up, and the Mac supply can't supply it. I suggest you test the drive - it doesn't hurt to just power them up with nothing else connected, but have the terminating resistors in. Have fun! Chris Stanfield, Mitel Corporation: E-mail to:- uunet!mitel!testeng1!stanfiel (613) 592 2122 Ext.4960 We do not inherit the world from our parents - we borrow it from our children.