Which 500GB SATA drive is compatible with APS?

[mjdl]

I'd like to upgrade the main disk in my W500 to 500GB, or possibly put the larger disk in an Ultrabay W500 carrier. I'd like APS to work for both drives.

Does anyone have any *actual* experience of using APS with such a high capacity drive?

I am thinking of the Hitachi Travelstar 5K500.B family of drives (9.5mm height), but the OEM hardware manual does not mention any "Unload immediate" command (which--I hope I have this right--does not write unwritten cached buffers but immediately parks the drive), only the "Idle immediate" command with "unload" feature:

Unload Feature:
The UNLOAD FEATURE of the IDLE IMMEDIATE command allows the host to immediately unload the heads.
The device stops read look-ahead if it is in process. If the device is performing a write operation, the device
suspends writing cached data onto the media as soon as possible. The data in the write cache is retained, and the
device resumes writing the cached data onto the media after receiving a Software Reset, a Hardware Reset, or any
new command except IDLE IMMEDIATE with UNLOAD FEATURE

I phoned HitachiGST support, and they told me that large OEM's like Lenovo do order OEM versions of their drives with custom microcode, and Hitachi support were not informed of what features that might affect.

Conceivably the Lenovo drives might use a different command code for "Idle immediate" which the regular, unmodified drive microcode does not support.

Anyone with more information?