The iStar 2½" to 3½" drive adapter features two hot-swap bays with hinged doors that open on the front. These also act as levers to push installed drives out from the rear when opening the door to remove them from the cage. The slots are stacked very close to fit both within the confines of a single 3½" drive bay and there are no provisions for cooling of any kind, either active or passive. Only one SATA power connection is required whether you use one drive or two, although separate data ports are provided for each drive.
The top slot is labeled for SATA1 and the bottom for SATA2. Once the drive is slid into the slot the door can be closed and the latch optionally locked using the provided keys. This helps to prevent unauthorized tampering when using the iStar cage in an external drive bay.
I'm installing the iStar BPU-2535v2 with the following hardware:
AMD Phenom II 1090T X6 BE
2x2Gb Crucial Ballistix Tracer DDR3-1600
Diamond Radeon HD5850
128Gb Crucial C300 RealSSD
Icy Dock 2½" Adapter
1Tb WD Caviar Black
Optiarc 24x DVD+/-RW
SilverStone Decathlon DA750
Cooler Master HAF 932 AMD Edition
The HAF 932 requires a 5¼" adapter for mounting a 3½" drive in one of the external bays, however the iStar BPU-2535v2 can also potentially be used internally as well. The mounting holes on the iStar are cut exactly like a floppy drive, which uses a smaller, fine-threaded hole compared to 3½" hard drives. Thus any case that utilizes snap-on rails or other tool-less, post style brackets may not work. The Cooler Master drive tray has removable posts however, and screws provided with the iStar can be used to secure it to the bracket. A blue LED on the left corner indicates power and activity for each drive slot, although they are not very bright.
Let's wrap things up with some final thoughts and conclusion.