IBM 05K5338 interface cards/adapter

ThinkPad UltraslimBay hard disk drive adapter The ThinkPad Ultraslimbay Hard Drive Adapter gives you maximum storage flexibility with your ThinkPad 600 system. This adapter lets you add a second hard drive to the UltraslimBay of your ThinkPad 600, enabling up to 36 GB of disk storage.
Features include:
-Enables additional storage expansion (up to 18 GB)
-Easy portability between ThinkPad systems