Due to our parent companies IT policies, our IT dept uses Guarianedge to encrypt laptop drives. I recently had my 2nd 7200rpm drive fail in my laptop (dell E6410), and so I was issued a Sandisk 128GB SATA3 drive. I wasn't able to benchmark it before it was installed and imaged, but from the reviews online, it operates up to 400MBps. Since my Laptop only supports SATA2, lets average this and say I should expect 150-200MBps. read and/or write speeds. However, this is not the case, and infact the SSD runs JUST as fast, as a 7200rpm drive, minus the faster access times. Can anyone explain this? Compared to Truecrypt (full drive), the performance is horrible. Someone else just got a 256GB SSD installed, and IT benchmarked it before and after applying Guardian Edge...they confirmed that after encryption, the drive performance was ~20% of the original speeds.
Sandisk SATA3 encrypted with Guardian Edge (full drive):
My coworkers 7200rpm 250GB SATA2 drive encrypted with Guardian Edge:
64GB Crucial C300 SATA2 drive in my file server (encrypted with TrueCrypt (full drive)