Oh yes, a very important point: do not forget to update the Firmware 009 available on the Crucial website.
It greatly increases the playback speed (from 400MB / s to 500MB / s) compared to the old 002 Firmware.
Installing the firmware is not obvious to a novice (change in the Bios the IDE mode instead of AHCI and Reboot from a boot disk containing the Firmware 009 program). Make the installation of Firmware preferably before installing Windows on your disk.
FLASH - UPDATE COMMENT TO 16 NOV 2011
**** Note a recent buyer (thank you): Apparently, book now CRUCIAL M4 with the new firmware 009, TIP-TOP :-) ****