Users of the Intel X25-M and X18-M SSDs were not happy when they learned that the firmware update that promised to increase write speeds actually killed Windows 7 installations. Intel removed the firmware update that added support for TRIM shortly after the reports started coming in of the Windows 7 issue.
The Tech Report reports that Intel has now issued a fixed the firmware for the SSDs that adds TRIM support back in for the drives without causing the data corruption that was seen the first time around. The new firmware is version 22CV102HD and is available for download now.
TRIM is a function that is supported to increase performance by clearing flash pages instead of marking them as available when the user deletes data. Intel may say the new firmware has fixed the data corruption issue but I still wouldn't want to be first to try it out personally.