Any external USB drive connected in Windows Vista by default is optimized for quick removal and not quick performance.
This is because it is assumed that any plugged in external drive will be removed at some point of time and a quick removal from the computer may result in data loss.
What if you use an external USB disk that is always connected to your computer?
In this case,we can optimize the USB disk performance by simply enabling “write caching” in Vista.
Fire up Device Manager by going to Start > Run > devmgmt.msc
Drill down to Disk drives and locate your external USB disk.Double click on disk icon and go to Policies.
Here,change the option from Optimize for quick removal to Optimize for performance.
Hit Ok,and restart Vista for changes to take full effect.
Hope this has been an informative post.
Peace.