microSD partition table and proper heads/sectors/cylinders # ?
Olivier Berger
oberger at ouvaton.org
Sun Sep 21 19:44:37 CEST 2008
Hi.
I noticed that initially, my 2GB microSD card was displaying :
# fdisk -l /dev/mmcblk0
Disk /dev/mmcblk0: 2032 MB, 2032664576 bytes
64 heads, 63 sectors/track, 984 cylinders
Units = cylinders of 4032 * 512 = 2064384 bytes
Device Boot Start End Blocks Id System
/dev/mmcblk0p1 1 984 1983619+ 6 FAT16
After Debian installer's partitioning step, it becomes :
# fdisk -l /dev/mmcblk0
Disk /dev/mmcblk0: 2032 MB, 2032664576 bytes
4 heads, 16 sectors/track, 62032 cylinders
Units = cylinders of 64 * 512 = 32768 bytes
Device Boot Start End Blocks Id System
/dev/mmcblk0p1 1 245 7832 83 Linux
/dev/mmcblk0p2 246 62032 1977184 83 Linux
Is there any rationale for the heads/sectors/cylinders difference ?
I'm not sure this is something that matters as I never really tried
and figure how the microSD memory to "disk" mapping is done.
Thanks in advance for any hints.
Best regards,
--
Olivier BERGER
(OpenPGP: 1024D/B4C5F37F)
http://www.olivierberger.com/weblog/
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