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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🚀 Hot-Swap Like a Pro — Speed, Security & Cool Efficiency in One Sleek Rack!

COOL UNDER PRESSURE - Vented solid aluminum chassis plus a speed-controlled fan ensures your drives stay chill and reliable.
BLAZING FAST DATA FLOW - Supports full SATA III/SAS II speeds up to 6 Gbps for lightning-quick transfers.
UNIVERSAL DRIVE COMPATIBILITY - Seamlessly works with SATA I/II/III and SAS I/II drives for ultimate flexibility.
SECURE HASSLE FREE HOT SWAPPING - Trayless design with individual ejection levers and key-locks keeps your drives safe and accessible.
BUILT FOR IT PROS BACKED FOR LIFE - 2-year warranty with lifetime 24/5 multilingual tech support keeps your setup future-proof.

The StarTech.com 3-Bay Hot Swap Backplane transforms two 5.25-inch bays into a high-performance, trayless mobile rack supporting up to three 3.5-inch SATA or SAS drives. Engineered for IT professionals, it delivers blazing 6 Gbps transfer speeds, robust key-lock security, and optimal thermal management via a vented aluminum enclosure and built-in fan. Compatible with SATA I/II/III and SAS I/II drives, it ensures versatile, secure, and efficient hot-swapping backed by a 2-year warranty and lifetime tech 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	STARTECH.COM LTD
Color	Black
Form Factor	3.5-inch
Processor Count	1
Hard Disk Description	External
Hard Drive Interface	Serial ATA
Hardware Platform	PC
Operating System	OS independent
Are Batteries Included	No
Item Weight	865 g

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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