some pen drives have this volumes and can see by clients ltsp

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              1        9589    77023611   83   FAT32

but exist others pen drives when are mounted system not recognize and have this list by shell


Disk /dev/sda: 131 MB, 131070976 bytes
5 heads, 50 sectors/track, 1023 cylinders
Units = cylinders of 250 * 512 = 128000 bytes

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

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   ?     7668509     9845991   272185273   6f  Unknown
Partition 1 has different physical/logical beginnings (non-Linux?):
     phys=(361, 101, 36) logical=(7668508, 3, 32)
Partition 1 has different physical/logical endings:
     phys=(255, 115, 46) logical=(9845990, 4, 27)
Partition 1 does not end on cylinder boundary.
/dev/sda2   ?     5371345     8488604   389657273   69  Unknown
Partition 2 has different physical/logical beginnings (non-Linux?):
     phys=(100, 101, 32) logical=(5371344, 4, 24)
Partition 2 has different physical/logical endings:
     phys=(367, 115, 35) logical=(8488603, 0, 19)
Partition 2 does not end on cylinder boundary.
/dev/sda3   ?      674597      674597           0   20  Unknown
Partition 3 has different physical/logical beginnings (non-Linux?):
     phys=(353, 117, 46) logical=(674596, 1, 19)
Partition 3 has different physical/logical endings:
     phys=(355, 116, 37) logical=(674596, 1, 18)
Partition 3 does not end on cylinder boundary.
/dev/sda4        11542725    11542946       27619    0  Empty
Partition 4 has different physical/logical beginnings (non-Linux?):
     phys=(0, 0, 0) logical=(11542724, 3, 3)
Partition 4 has different physical/logical endings:
     phys=(0, 0, 0) logical=(11542945, 2, 40)
Partition 4 does not end on cylinder boundary.

Partition table entries are not in disk order


then.. in my box.. (not client) i can see and work with this pendrive but
in clients can't used.. what i have with users when they comes to save something are saved of internet to take
for home????