Mount: You must specify the filesystem type

1: $ sudo fdisk-ls

Disk/dev/SDB: 8036 MB, 8036286464 bytes
248 heads, 62 sectors/track, 1020 cylinders, total 15695872 sectors
Units = sectors of 1*512 = 512 bytes
Sector size (logical/physical): 512 bytes/512 bytes
I/O size (minimum/optimal): 512 bytes/512 bytes
Disk identifier: 0x00000000

Device boot start end blocks ID system
/Dev/sdb1*2048 133119 65536 C w95 FAT32 (LBA)
/Dev/sdb2 133120 15695871 7781376 83 Linux

2: $ sudo Mount/dev/sdb1/tmp/mmc1

=> OK;

Sudo Mount/dev/sdb2/tmp/mmc2

=> Mount: You must specify the filesystem type

3: $ sudo mkfs. ext3/dev/sdb2

=> OK;

4: $ sudo Mount/dev/sdb2/tmp/mmc2

=> Mount: You must specify the filesystem type

5: $ sudo Mount-T ext3/dev/sdb2/tmp/mmc2

=> Mount: Wrong FS type, bad option, bad superblock on/dev/sdb2,
Missing codePage or Helper Program, or other error
In some cases useful info is found in syslog-try
Dmesg | tail or so

6: $ dmesg | tail

=> [534.496845] SD 4: 0: 0: 0: [SDB] Assuming drive cache: Write Through
[1, 534.500641] SDB: sdb1 sdb2
[534.521625] SD 4: 0: 0: 0: [SDB] No caching mode page present
[534.521630] SD 4: 0: 0: 0: [SDB] Assuming drive cache: Write Through
[534.521633] SD 4: 0: 0: 0: [SDB] Attached SCSI removable disk
[604.743249] EXT3-fs (sdb2): Error: Can't Find ext3 filesystem on dev sdb2.
[604.791308] EXT4-fs (sdb2): VFS: Can't Find ext4 filesystem
[604.862243] Fat-FS (sdb2): bogus number of reserved sectors
[604.862248] Fat-FS (sdb2): Can't find a valid fat filesystem
[622.050513] EXT3-fs (sdb2): Error: Can't Find ext3 filesystem on dev sdb2.

Why?

Bytes ------------------------------------------------------------------------------------------------------------

Just now: I deleted the original partition: 4 new partitions are created;

1: $ sudo fdisk-ls/dev/SDC

=> Disk/dev/SDC: 8036 MB, 8036286464 bytes
248 heads, 62 sectors/track, 1020 cylinders, total 15695872 sectors
Units = sectors of 1*512 = 512 bytes
Sector size (logical/physical): 512 bytes/512 bytes
I/O size (minimum/optimal): 512 bytes/512 bytes
Disk identifier: 0x00000000

Device boot start end blocks ID system
/Dev/sdc1*2048 133119 65536 C w95 FAT32 (LBA)
/Dev/sdc2 133120 15695871 7781376 5 extended
/Dev/sdc5 135168 2232319 1048576 83 Linux
/Dev/sdc6 2234368 15695871 6730752 83 Linux

2: $ sudo Mount/dev/sdc1/tmp/mmc1 => OK;

$ Sudo Mount/dev/sdc5/tmp/mmc2 => OK;

$ Sudo Mount/dev/sdc6/tmp/mmc3 => mount: You must specify the filesystem type;

I already: mkfs. ext3/dev/sdc6 ......

A good phenomenon is: I copied the android enlightening program to: sdc1 and decompressed rootfs to: sdc5. After power-on, pandaboard can be started ...... Serial Port output startup information ...... Although you cannot enter the login interface ......