Thread: Update: SD/SDHC Card Trashing - Nokia Admit There's a Problem
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Milhouse is offline Milhouse
2007-09-28 , 17:00
Posts: 3,401 | Thanked: 1,255 times | Joined on Nov 2005 @ London, UK
#24
Originally Posted by PowerUser View Post
Okay, take a look on scheme and please explain then how this happens and why, then.Both cards are attached to the same IC named "Menelaus" which does performs power regulations(this activity can be seen in dmesg log as well).It is pretty doubtful it has non-symmetric properties for same functional pins.So I guess electrical properties are near the same (plus or minus minor issues due to PCB layout).Of course corrections from Nokia staff are OK.Guy who posted this not seems to be Nokia staff.Or I'm wrong?
The internal slot has the capacity to provide a higher voltage than the external slot - as such, when the voltage drops perhaps the internal slot is still providing sufficient voltage to avoid any corruption because it was providing a higher voltage in the first place. The external slot on the other hand in a similar situation dips below the critical voltage threshold and card corruption is the result.

Post #64 is from a Nokia employee, and his comments are backed up by similar observations from the Linux kernel developer who originally added SDHC support.
Last edited by Milhouse; 2007-09-28 at 17:04.