On Tue, Mar 08, 2011 at 04:59:18PM +0100, Loïc Minier wrote:
On Tue, Mar 08, 2011, Shawn Guo wrote:
I'm scanning all 7 cards I have with the script wait_device, each card with 10 iterations of the test.
- Transend 4GB SD
- SanDisk 2GB SD
- KingMax MMC Mobile 2GB
All above 3 cards passed the test with giving "Could list partitions after 0 seconds!"
- SanDisk 4GB SD
- SanDisk 4GB SD
- SanDisk 4GB SD
- SanDisk 4GB SD
All above 4 cards failed with giving "Giving up after 30 seconds failing to list partitions". The interesting thing is it does not always fail from the beginning. Some cards can even pass the test for 4~5 iterations, and then start failing. If it starts failing, it always fails until I remove the card and replug it.
This is really valuable data; SanDisk 4 GB SDs seem to be a trend above! It would be interesting if you could borrow another USB reader for some hours to run the tests on the same SD cards, but a different adapter.
Today in office, with another reader and another maverick machine, the result seems consistent. The new thing is those four failing cards sometime ends up with "Could list partitions after 2 seconds!", besides the two possible results reported before, 0 second and failed to list.