Here is the definitive list of hardware and software specifications for this model.
Dedicated SD Memory Card Slot (SDHC compatible) and a separate Sony Memory Stick Duo slot Sony Vaio Pcg-31311m Specs
Most PCG-31311M units came with a 1.8-inch ZIF HDD spinning at 4200 RPM. This makes the boot time over 2 minutes and opening any app a test of patience. (If you find an SSD version, buy it). Here is the definitive list of hardware and