In Toshiba notebooks most screws are marked. Here are some examples:
F4 - flat-head screw 4mm long
B6 - button-head screw 6mm long
F16 - flat-head screw 16mm long
B8 - button-head screw 8mm long
When you are taking apart a laptop you'll have to deal with lots of screws. Keep everything organized.
To apart take a paper Mark all the screw position and used cello tape and paste every screw..
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