What's the performance impact of using a 256 bit encryption key instead of 128 for Bitlocker?

I haven't noticed any significant performance difference. BUT in general most machines I've encrypted have been inconsistent in how long they take to encrypt anyway. Also a lot of the drives I've encrypted have been SSD's It's a background process anyway so I wouldn't worry about it too much. If it gives you improved security and that's your perogative I wouldn't worry about a few extra minutesPLEASE MARK ANY ANSWERS TO HELP OTHERS Blog: rorymon.com Twitter: @Rorymon

Hi, Please refer to the reply by Rorymon. If you have further question on this, please let us know. Juke Chou TechNet Subscriber Support If you are TechNet Subscription user and have any feedback on our support quality, please send your feedbackhere.Juke Chou TechNet Community Support

Thanks Rorymon. I am trying to get numbers that I can go by to make a decision on which key length to go with. Do you know of any benchmarking done on this and where to find such information?

I think my question was misunderstood. I am basically asking for the impact of 128 vs 256 bit keys on the machine's general performance after the disk is encrypted.

Hi, OK, I found a site has the result of Bechmark test, please access http://4sysops.com/archives/bitlocker-vs-truecrypt-performance-benchmark/ Juke Chou TechNet Community Support

Hi, Hows everything going? Please feel free to give me any update. Thank you for your cooperation. Regards, Leo Huang TechNet Subscriber Support If you are TechNet Subscription user and have any feedback on our support quality, please send your feedback here.Leo Huang TechNet Community Support