Samsung GALAXY TAB GT-P1000 - Manual (Page 11)

Assembling 11
Push the memory card gently until it disengages from the device.
3
Pull the memory card out of the memory card slot.
4
Do not remove a memory card while the device is transferring or
accessing information, as this could result in loss of data or damage
to the memory card or device.
Format the memory card
›
Formatting your memory card on a PC may cause incompatibilities with
your device. Format the memory card only on the device.
In Menu mode, select Settings
→ SD card and phone storage →
Unmount SD card → Format SD card → Format SD card → Erase
everything.
Before formatting the memory card, remember to make
backup copies of all important data stored on your device. The
manufacturer’s warranty does not cover loss of data resulting from
user actions.