Ultrabay Slim SATA HDD Adapter

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Ultrabay Slim SATA HDD Adapter (40Y8725)

This is an adapter that slides into an Ultrabay Slim.


  • One SATA slot for a 2.5-inch, 7 or 9.5-millimeter HDD/SSD/SSHD
  • Marvell 88SA8040-TBC (SATA-to-PATA bridge controller)
  • Weight: 105 grams or 0.23 pounds


  1. This HDD adapter requires a caddy tray/bracket to be screwed onto the 2.5-inch storage drive, however if that is not possible, the screws can be used instead of the caddy tray/bracket.
  2. This model is unsupported, but the adapter will fit-in and function as it has a compatible connector to accept the adapter. The main problem would be the removal of the adapter, as these models lack any sort of ejection mechanism to conveniently remove the adapter.

UltraBay Slim SATA HDD Adapter.gif


The adapter has a black plastic grommet located at the back that restricts its use to the x6x series ThinkPads. Some have successfully removed this grommet with a pair of channel lock pliers, or sliced it off with a Dremel to fit into older ThinkPads like the T40 series. This works because the adapter has a matching connector that fits into the Ultrabay Slim in the T40 series ThinkPads.

Part numbers

Branded as the ThinkPad Serial ATA Hard Drive Bay Adapter

  • 45J7901 (45J7902), 26R9246 (26R9247)

Linux support

If connected at boot time, the drive is normally /dev/sdb.

Models supporting this accessory

with the grommet intact

with the grommet obliterated