mount USB drive on linux

1, before connect USB do
[root@localhost intel]# fdisk -l

Disk /dev/sda: 80.0 GB, 80000000000 bytes
255 heads, 63 sectors/track, 9726 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 9726 78019672+ 8e Linux LVM

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 121601 976760001 83 Linux

2, after connect usa drive, do
[root@localhost intel]# fdisk -l

Disk /dev/sda: 80.0 GB, 80000000000 bytes
255 heads, 63 sectors/track, 9726 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 9726 78019672+ 8e Linux LVM

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 1 121601 976760001 83 Linux

Disk /dev/sdc: 2030 MB, 2030043136 bytes
63 heads, 62 sectors/track, 1015 cylinders
Units = cylinders of 3906 * 512 = 1999872 bytes

This doesn't look like a partition table
Probably you selected the wrong device.

Device Boot Start End Blocks Id System
/dev/sdc1 ? 773303 773432 253319 e4 SpeedStor
Partition 1 has different physical/logical beginnings (non-Linux?):
phys=(190, 120, 0) logical=(773302, 15, 51)
Partition 1 has different physical/logical endings:
phys=(544, 125, 44) logical=(773431, 60, 24)
Partition 1 does not end on cylinder boundary.
/dev/sdc2 ? 257697 766649 993984023 98 Unknown
Partition 2 has different physical/logical beginnings (non-Linux?):
phys=(1010, 16, 43) logical=(257696, 24, 10)
Partition 2 has different physical/logical endings:
phys=(205, 205, 22) logical=(766648, 48, 55)
Partition 2 does not end on cylinder boundary.
/dev/sdc3 ? 434364 925892 959953209 7d Unknown
Partition 3 has different physical/logical beginnings (non-Linux?):
phys=(252, 139, 46) logical=(434363, 62, 54)
Partition 3 has different physical/logical endings:
phys=(367, 195, 2) logical=(925891, 31, 25)
Partition 3 does not end on cylinder boundary.
/dev/sdc4 ? 1427 3557 4161536 0 Empty
Partition 4 has different physical/logical beginnings (non-Linux?):
phys=(0, 10, 0) logical=(1426, 9, 47)
Partition 4 has different physical/logical endings:
phys=(0, 0, 0) logical=(3556, 62, 52)
Partition 4 does not end on cylinder boundary.

Partition table entries are not in disk order

3,
mount /dev/sdc /flash/