Read and write to two 2.5" or 3.5" SATA hard drives or solid state drives at once with this Thermaltake BlacX ST0014U-C docking station, which offers a hot-swappable design to ensure rapid file transfers via the USB interface.
You have to cycle the power off and on again before the computer will recognize discs inserted into the device.
If you have 2 drives mounted you can't unmount just a single drive. If you eject just a single drive and remove it the second drive will also be unmounted and you will get a warning that the second disc drive was improperly removed.
The unit will take the drive(s) offline at random intervals for no apparent reason. (This usually doesn't happen until the drives have been mounted for at least a few hours but makes it a real pain to do overnight backups.)
If you're using the unit for temporary storage or transferring files it's okay, but I wouldn't trust it to be able to make backup copies overnight without going offline.
I have two of these units, but only because I really need this functionality and I can't find any alternatives locally. I wouldn't have bought the second one if I could find a reasonably priced (or indeed any) alternative in the area.
If it weren't for the randomly going offline I give this 3/5 stars and a lukewarm 'buy' recommendation.
I'm running this on MacPros using OS 10.10.4 (Yosemite).