Sony VAIO VGN-P - Manual (Page 41)

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Using Your VAIO Computer >
Using "Memory Stick"
!
Be sure to hold "Memory Stick" with the arrow pointing in the correct direction as you insert it into the slot. To avoid damaging your computer or the
media, do not force "Memory Stick" into the slot if you cannot insert it smoothly.
Before using "Memory Stick Micro" ("M2"), be sure to insert it into an "M2" Duo adaptor. If you insert the media directly into the "Memory Stick Duo"
slot without the adaptor, you may not be able to remove it from the slot.