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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StarTech 3-Bay 3.5in SATA SAS Trayless Backplane, 6Gbps (HSB3SATSASBA)

Product ID: 56271250

Details

Brand
StarTech
Colour
Black
Hardware interface
SAS
Hardware platform
PC
Product dimensions
19.4L x 14.6W

⚡6Gbps SATA/SAS interface

💾3 hot-swappable 3.5in bays

❄️Aluminum vented chassis + fan control

AED 679

Duties & taxes included

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Description

🚀 Elevate your storage game with seamless speed & security!

SECURE SWIFT ACCESS - Individual ejection levers with key-lock for fast, safe drive swaps
SMART THERMAL MANAGEMENT - Vented aluminum enclosure plus adjustable fan keeps drives cool
IT PRO TRUSTED RELIABILITY - Backed by 2-year warranty & 24/5 multilingual tech support
TRIPLE DRIVE HOT SWAP POWER - Maximize uptime with 3 trayless bays in just 2 slots
UNIVERSAL SATA SAS COMPATIBILITY - Seamlessly supports SATA I/II/III & SAS I/II drives

The StarTech 3-Bay Trayless Backplane transforms two 5.25in bays into a high-performance hot-swap hub for three 3.5in SATA or SAS drives, delivering blazing 6Gbps transfer speeds. Its vented aluminum design with fan control ensures optimal cooling, while key-lock ejection levers provide secure, tool-free drive swaps. Engineered for IT pros, it offers broad compatibility, robust build quality, and dedicated technical support.

Specifications

ASIN	B00HS23QZO
Best Sellers Rank	46,773 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 221 in Enclosures
Box Contents	Storage mobile rack
Brand Name	StarTech
Colour	Black
Compatible Devices	PC
Customer Reviews	4.3 4.3 out of 5 stars (556)
Data Transfer Rate	6 Megabits Per Second
EU Spare Part Availability Duration	2 Years
Enclosure Material	Aluminium
Global Trade Identification Number	00065030855297
Hardware Interface	SAS
Hardware Platform	PC
Item Dimensions L x W x H	19.4L x 14.6W x 8.5H centimetres
Item Highlight	Hot-swap three 3.5in drives in two 5.25in bays, SAS II SATA III 6Gbps, Aluminium vented, Fan control, Keys
Item Type Name	Startech.Com HSB3SATSASBA 3 Bay Trayless Hot Swap 3.5" SATA HDD Mobile Rack Backplane, Storage, Black
Item Weight	0.87 Kilograms
Manufacturer	StarTech.com
Manufacturer Part Number	HSB3SATSASBA
Memory Storage Capacity	6 GB
Model Number	HSB3SATSASBA
Network Connectivity Technology	SATA
Number of Items	1
Number of Packs	1
Supported Devices Quantity	3
The Standard Size of the Hard Drive or the Bay the Hard Drive Is Compatible With (in inches)	3.5 Inches
UPC	065030855297
Unit Count	1.0 count

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