Over several years I ran 4 Travelstar drives in my PDQ Wallstreet without ever seeing the 'magnetic shielding' issue (2 of 20GB, 60GB, 80GB) Then, only last year, I began to have problems following upgrade to a 120GB drive. The symptoms appeared to match the magnetic shielding idea - the machine would boot up and run without problem, but after sleeping would refuse to wake. I installed strips of metal to the drive, and waved magnets around the sensor area, all to no avail. But... if I booted from one of the old HDDs in the expansion bay the problem did not occur (the new 120GB drive still spinning up internally, so the magnetic issue should not have changed). Clearly, there was something else happening. I found the answer in the CPU management (I have Daystar's 'XLR8 MACh Speed Control', there are freeware alternatives such as PowerLogix CPU Director) When I enabled the "write-through to disk" preference, the problem disappeared.
hope this helps someone... Alan Dow ========================================================== On 2009-10-07 02:19 -0700, Dan Knight, LowEndMac.com wrote: >Hi Gary, > >Probably a Travelstar hard drive. As a WallStreet owner, I did a lot >of research on this problem before putting a Travelstar drive in mine. >I read a lot about magnetic shielding and using a bit of copper or >whatever to shield the drive from the sensor in the lid. > >I also read that magnetic shielding requires a lot more than that. My >best guess - and after all my research, that's all it is - is that the >so-called shielding solutions don't work by shielding the drive so >much as moving it far enough away from the sensor that the magnetic >field is sufficiently reduced. > >I put about 4 layers of antistatic mylar between my Travelstar hard >drive and the bracket that holds it in place, and I've had no problems >with my WallStreet sleeping when I shut the lid - and waking up with a >keypress after I open it. Mylar has no magnetic properties whatsoever. > >Dan Knight, LowEndMac.com > >On Oct 7, 3:16 am, GaryED43 <[email protected]> wrote: >> Thanks everyone from following your instructions I was able to >> discover the problem. Its the HD and its magneticly screwing up the >> powerbook where it doesn't come out of sleep mode. >> >> thank you > > Gary --~--~---------~--~----~------------~-------~--~----~ You received this message because you are a member of G-Books, a group for those using G3 iBooks and PowerBooks (we run a separate list for G4 'Books). The list FAQ is at http://lowendmac.com/lists/g-books.html and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g-books Support for older Macs: http://lowendmac.com/services/ -~----------~----~----~----~------~----~------~--~---
