By default whenever you access a file in NTFS the filesystem writes to the drive the time at which you accessed the file. When accessing a large number of files, and writing small bits of data in lots of different places, updating all of the access times can be burdensome and slow down performance. Disabling this feature will cause NTFS to no longer write the time at which you access a file when you do.
Please note: disabling this feature can cause problems for some automated backup systems. If you are using an automated backup system, please check to make sure it functions properly with this support disabled, as we assume no responsibility for lost data in the event of a failed backup as a result of changing this setting.
To disable last access time support, click Start --> Run, type 'cmd' and hit enter. Then type:
fsutil behavior set disablelastaccess 1
To re-enable last access time support in the event of any issues, click Start --> Run, type 'cmd' and hit enter. Then type:
fsutil behavior set disablelastaccess 0