Can I turn each hard drive off or are they all on one switch?

each one has a power switch. I use these for systems that require a fast clone recovery. I hook up the two top bays to power and data. Put the system drive in the top bay. Place a drive to be cloned into the center. Clone it. Then store it in the bottom not hooked up bay. In case of failure just put the spare in the online slot. Back up in seconds not hours or days.

I see this can interface with sas drives - does it act as a sas controller or does my board need to have an sas controller?

No, the HSB3SATSASBA allows SAS drives to connect but is not a SAS controller. Your computer will still need a SAS controller to read the drives. Matt, StarTech.com Support

Does anyone know if this will fit into an hp z640? worried about how it slides in and mounts with the z640's 5.25" bays.

The HSB3SATSASBA has not been tested on an HP z640. The rack uses standard 5.25" mounting points. Brandon, StarTech.com Support

will this function normally if mounted sideways?

It should, there are cases, storage devices, and NAS devices from big name manufacturers where hard drives are positioned on their side with no problems.

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💼 Elevate your storage game with the ultimate 3-bay backplane—because your data deserves the best!

COMPACT DURABLE - Sleek black chassis with a lightweight 865g frame fits perfectly in any professional setup.
PRO GRADE COMPATIBILITY - Engineered for PC hardware platforms, ensuring smooth integration with your existing infrastructure.
TRIPLE DRIVE POWERHOUSE - Maximize storage with 3 hot-swappable 3.5-inch bays for seamless data management.
PLUG AND PLAY EFFICIENCY - Simplify upgrades and maintenance with easy hot-swappable drive access—no downtime required.
LIGHTNING FAST CONNECTIVITY - Supports both SATA and SAS interfaces to turbocharge your data transfer speeds.

The StarTech 3 Bay Mobile Rack Backplane (model HSB3SATSASBA) is a compact, black 3.5-inch form factor device designed to house three hard drives simultaneously. Weighing just 865 grams and measuring 19.4 x 14.6 x 8.5 cm, it supports both SATA and SAS interfaces for high-speed data transfer, making it an ideal solution for professional-grade PC storage expansion and hot-swappable drive management.

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Brand	StarTech
Manufacturer	STARTECH.COM
Colour	black
Form Factor	3.5-inch
Item Height	8.5 Centimeters
Item Width	14.6 Centimeters
Product Dimensions	19.4 x 14.6 x 8.5 cm; 865 g
Item model number	HSB3SATSASBA
Processor Count	1
Hardware Platform	PC
Are Batteries Included	No
Manufacturer	STARTECH.COM
Item Weight	865 g

3 Bay Mobile Rack Backplane

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