Samsung Seek SPH-M350 Online User's Manual page 100

Important:
The phone does not support formatting of the
microSD card using anything other than FAT32.
FAT12 or FAT16 formatting file systems are not
supported.
FAT32 is the file system utilized in some of the
older versions of Microsoft Windows.
Important Connection Information
To use the USB Memory Card mode, the microSD
card must be installed before connecting the
Samsung Seek to your computer.
To avoid loss of data, DO NOT remove the USB
cable, the microSD card, or the battery while files are
being accessed or transferred.
DO NOT use your computer to change or edit folder
or file names on the microSD, and do not attempt to
transfer large amounts of data from the computer to
the microSD card. Doing so may cause the microSD
card to fail.
DO NOT turn off or restart your computer, or return to
the unlock screen, while using a mass storage
device. Doing so will result in loss or damage of data.
90 2G. microSD Card
While your phone is connected to the computer, your
phone's screen will display "
"Connected to Computer." You can make or receive
calls while your phone is connected to the computer,
but not when you are actively using the USB
connection. To inactivate your USB connection while
your phone is connected to your computer, slide the
bar on the phone's screen to the right.
Disconnect
You can now make and receive calls, and your
phone will continue to charge through the computer
connection.
If you connect a mass storage device to a peripheral
device, your phone may not work properly.
" and
Phone Off