GEOM weirdness with SD flash reader?
Dmitry Morozovsky
marck at rinet.ru
Sun Jul 1 20:10:53 UTC 2007
On Sun, 1 Jul 2007, Nate Lawson wrote:
NL> Simply trying to mount a FAT filesystem in an external USB SD flash
NL> reader. The reader works fine, no errors in dmesg.
NL>
NL> deenlo# fdisk da2
NL> ******* Working on device /dev/da2 *******
NL> parameters extracted from in-core disklabel are:
NL> cylinders=982 heads=64 sectors/track=32 (2048 blks/cyl)
NL>
NL> parameters to be used for BIOS calculations are:
NL> cylinders=982 heads=64 sectors/track=32 (2048 blks/cyl)
NL>
NL> Media sector size is 512
NL> Warning: BIOS sector numbering starts with sector 1
NL> Information from DOS bootblock is:
NL> The data for partition 1 is:
NL> sysid 6 (0x06),(Primary 'big' DOS (>= 32MB))
NL> start 243, size 2011917 (982 Meg), flag 0
NL> beg: cyl 0/ head 3/ sector 55;
NL> end: cyl 998/ head 3/ sector 3
NL> The data for partition 2 is:
NL> <UNUSED>
NL> The data for partition 3 is:
NL> <UNUSED>
NL> The data for partition 4 is:
NL> <UNUSED>
NL> deenlo# mount -t msdosfs /dev/da2s1 /mnt/dos
NL> mount_msdosfs: /dev/da2s1: No such file or directory
NL> deenlo# mount -t msdosfs /dev/da2 /mnt/dos
NL> mount_msdosfs: /dev/da2: Invalid argument
NL> deenlo# mount -t msdosfs /dev/da2s1 /mnt/dos
NL> [success]
NL>
NL> So I'm guessing GEOM had to decide to create /dev/da2s1 after I tried to
NL> mount /dev/da2 directly? Nothing else would create the da2s1 device.
NL> Once the device was created with make_dev(), repeated unmounts/mounts
NL> work fine.
Do you insert your card after reader got initialized? I have internal reader in
my work machine, and have to use
dd if=/dev/null of=/dev/daN count=0
to [re]initialize GEOM providers on newly inserted card...
Sincerely,
D.Marck [DM5020, MCK-RIPE, DM3-RIPN]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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