Acer Aspire 1660 - Manual (Page 56)

Peripherals and options 46
English
3 Insert the memory module diagonally in the slot (1), and then
press down gently until it clicks in place (2).
4 Replace the memory compartment door, and fasten the screw.
The computer automatically detects the new module and reconfigures
the memory.
Hard disk upgrade
It is possible to replace your hard disk with a higher capacity drive
when you need more storage space. Your computer uses a 9.5mm 2.5-
inch Enhanced-IDE hard disk. Consult your dealer if you need to
perform a hard disk upgrade.