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 hot-swap speed and pro-grade cooling!

TOOL FREE TRAYLESS DESIGN - Quick install & removal with individual ejection levers and secure key-lock system—effortless and safe.
IT PRO TRUSTED RELIABILITY - Backed by 2-year warranty and lifetime 24/5 multilingual support—your enterprise storage guardian.
TRIPLE DRIVE HOT SWAP POWER - Transform two 5.25in bays into a seamless 3-drive hot-swap powerhouse for ultimate productivity.
OPTIMIZED THERMAL MANAGEMENT - Vented aluminum enclosure plus adjustable fan keeps drives cool and reliable under pressure.
UNIVERSAL DRIVE COMPATIBILITY - Supports SATA I/II/III & SAS I/II drives—future-proof your enterprise storage setup.

The StarTech.com 3-Bay Hot Swap Backplane converts two 5.25in bays into a high-speed, trayless mobile rack supporting up to three 3.5in SATA or SAS hard drives at 6 Gbps. Featuring a vented aluminum chassis with a speed-controlled fan, it ensures optimal drive temperatures. Designed for IT professionals, it offers tool-free drive ejection with key-lock security and is backed by a 2-year warranty plus lifetime 24/5 technical support.

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Brand	StarTech
Product Dimensions	19.4 x 14.6 x 8.5 cm; 865 g
Item model number	HSB3SATSASBA
Manufacturer	StarTech.com
Series	HSB3SATSASBA
Colour	Black
Form Factor	3.5-inch
Processor Count	1
Hard Drive Interface	Serial ATA
Hardware Platform	PC
Operating System	OS independent
Are Batteries Included	No
Item Weight	865 g
Guaranteed software updates until	unknown

StarTechcom 3-Bay Hot Swap Backplane for 3.5in SAS II/SATA III - 6 Gbps HDD - Aluminum Trayless Mobile Rack Backplane (HSB3SATSASBA)

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