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

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

Product ID: 10002128

Details

Brand
StarTech.com
Color
Black
Hardware Interface
SAS
Hardware Platform
PC
Product Dimensions
7.64"L x x

⚡6 Gbps SATA III/SAS II speed

💾3 hot-swappable 3.5in bays

❄️Aluminum vented chassis + fan

SAR 546

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Description

🚀 Elevate your storage game with instant hot-swap freedom!

SECURE TRAYLESS DESIGN - Key-lock and ejection levers for fast, safe drive access
IT PRO TRUSTED RELIABILITY - Backed by 2-year warranty & 24/5 multilingual tech support
TRIPLE DRIVE HOT SWAP POWER - Seamlessly swap up to 3 drives without downtime
OPTIMIZED THERMAL MANAGEMENT - Vented aluminum enclosure with speed-controlled fan prevents overheating
UNIVERSAL SATA SAS COMPATIBILITY - Supports SATA I/II/III & SAS I/II for ultimate flexibility

The StarTech.com 3-Bay Hot Swap Backplane transforms two 5.25" bays into a high-speed, trayless mobile rack supporting up to three 3.5" SATA or SAS drives at 6 Gbps. Its aluminum vented enclosure with a built-in fan ensures optimal cooling, while key-lock security and individual ejection levers provide quick, safe drive swaps. Designed for IT professionals, it offers broad compatibility and is backed by a 2-year warranty with expert support.

Specifications

ASIN	B00HS23QZO
Best Sellers Rank	#265 in Enclosures
Brand	StarTech.com
Built-In Media	Storage mobile rack
Color	Black
Compatible Devices	PC
Connectivity Technology	SATA
Customer Reviews	4.3 4.3 out of 5 stars (574)
Data Transfer Rate	6 megabits_per_second
Enclosure Material	Aluminum
Global Trade Identification Number	00065030855297
Hard Disk Form Factor	3.5 inches
Hardware Interface	SAS
Hardware Platform	PC
Item Dimensions L x W x H	7.64"L x 5.75"W x 3.35"H
Item Type Name	Startech.Com HSB3SATSASBA 3 Bay Trayless Hot Swap 3.5" SATA HDD Mobile Rack Backplane, Storage, Black
Item Weight	0.87 kg
Manufacturer	StarTech.com
Memory Storage Capacity	6 GB
Mfr Part Number	HSB3SATSASBA
Model Number	HSB3SATSASBA
Number of Items	1
Supported Devices Quantity	3
UPC	065030855297
Unit Count	1 Count
Warranty Description	2 Years

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