Well, as you know, none of those drives support AAM so I can't get "on" or "off" results.... but every time I tested them the random access time was around 14-15ms. Actually slower than some of my smaller drives, like the 40GB ST340016A (Baracuda ATA IV) or the 40GB 120GXP IBM Deskstar, IC35L040AVVN07-0, they get around 12-13ms with AAM off and with AAM on (128) that number increases to around 19ms.... quite a difference. I find a value of 190 to be a nice balance between noise and speed since at this point in their life (16,000-19,000 hours and 5,000-7,000 power cycles) they do sound somewhat worse for wear. I think the access times are faster because the data density is less along with the amount of platters and disk space, so they can access the data faster, at least in that regard.