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The issue here is almost certainly (I would say with ~98% certainty) with the system BIOS, not the SSD. You will need to spend a lot of time banging on Acer Technical Support to get through to an engineer who can address this problem with a BIOS update. There is no reason why changing SATA controller operation should "tickle" password prompting, and this is compounded by the fact that once you change things *back* to AHCI you get prompted again. Acer will need to address this shortcoming via a BIOS update.
I agree. Actually, I found a posting from a guy on an OCZ board that was having the same issue. So... must be the laptop... not the drive. After messing with it some more, I found that the issue only arose upon a full shutdown and subsequent bootup. Reboots didn't seem to have this issue. I was willing to deal with this, but then thought... eh... I'll just get rid of the SATA password and use 3rd party encryption. Probably better anyways. So, I finished setting my drive up as desired, then proceeded to use truecrypt 7.0a full disk encryption to encrypt the drive. Won't boot. Won't even fully POST. Just freezes directly after the memory check... not allowing me to enter the BIOS setup. What's funny, is before truecrypt allows you to encrypt the drive, it installs its boot loader and reboots the system, just to check for compatibility. There were no issues with this. But after encryption... useless. Very irritating. Anyhow... I'm mostly listing this info in an effort to document it on-line, and hopefully help others. Acer support was useless. Don't have the time to deal with them. I submitted a support ticket, only to be told that their primary support group only supports the 1830T with its original components, and that I'd have to pay for upgraded support -- which I imagine would be equally useless in helping to resolve this problem. Guess I'll just wait to see if they put out a BIOS update that addresses the issue.