Rails Secure Drives Firmly
It doesn't get any fussier. The drive bracket is affixed directly to the case, turning installation into a tightrope routine. A small hook has to engage in the drive holes before the drive can be positioned properly. That may sound easy, but it isn't. Unless you hold down the locking mechanism the entire time while inserting the drive, the hook will inevitably scratch up the drive.
The drives are installed with a rather complicated mounting system.
Removable hard drive carrier: this makes hardware installation easier
Motherboard and drives get in each others' way after installation