Re: Unable to mount the SD card formatted using the DIGITAL CAMREAon Linux box

Mukund JB. wrote:
> Dear all,
>
> I have problem in mounting my SD device.
> I have a commotion in resolving an issue with sfdisk info.
> The sfdisk displays my device partition and cylinder info as follows.
>
> #sfdisk -lV /dev/tfa0
>
> Disk /dev/tfa0: 448 cylinders, 2 heads, 32 sectors/track
> Units = cylinders of 32768 bytes, blocks of 1024 bytes, counting from 0
>
> Device Boot Start End #cyls #blocks Id System
> /dev/tfa0p1 * 0+ 449 450- 14371+ 1 FAT12
> /dev/tfa0p2 0 - 0 0 0 Empty
> /dev/tfa0p3 0 - 0 0 0 Empty
> /dev/tfa0p4 0 - 0 0 0 Empty
> Warning: partition 1 extends past end of disk
>
> The SD card driver is returning the following info to the HDIO_GETGEO
> ioctl called from sfdisk.
> ------------- driver messages ---------------------------
> TIFM INFO | invoked!
> TIFM INFO | geo.cylinders = 450
> TIFM INFO | geo.heads = 2
> TIFM INFO | geo.sectors = 32
> TIFM INFO | geo.start = 0
>
> When we have a close look at the cylinder info returned by driver &
> sfdisk, they differ.
> When I refer to the SD card manufacture spec, it reveals the n/o
> cylinders are 450. So, driver is returning the exact/proper cylinder
> value.
>
> Why is sfdisk giving improper cylinder info?
> Can some one explain me how this mismatch info between the driver and
> application can effect my mounting of my device?
> I assume HDIO_GETGEO is the only way sfdisk communicates with the
> driver.
>
> Regards,
> Mukund Jampala
SFDISK(8) Linux Programmer's Manual SFDISK(8)

NAME
sfdisk - Partition table manipulator for Linux

SYNOPSIS
sfdisk [options] device
sfdisk -s [partition]

DESCRIPTION
sfdisk has four (main) uses:
list the size of a partition,
list the partitions on a device,
check the partitions on a device, and
- very dangerous - repartition a device.

Uh, let me repeat that last line:
- very dangerous - repartition a device.

I suggest using fdisk to partition the device or let your
camera (re)format the media.

HTH, Chuck



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