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 | Hot-swap three 3.5in drives in two 5.25in bays, SAS II SATA III 6Gbps, Aluminum vented, Fan control, Keys

StarTech.com 3-Bay Hot Swap Backplane for 3.5in SAS II/SATA III - 6 Gbps HDD - Aluminum Trayless Mobile Rack Backplane (HSB3SATSASBA),Black | Hot-swap three 3.5in drives in two 5.25in bays, SAS II SATA III 6Gbps, Aluminum vented, Fan control, Keys

Product ID: 10002128

Details

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

⚡6 Gbps SAS II/SATA III speed

💾3 hot-swappable 3.5in drives

❄️Aluminum vented chassis + fan control

$U9520

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Description

🚀 Unlock blazing 6Gbps hot-swap storage — because downtime is so last decade!

SECURE TRAYLESS DESIGN - Quick ejection levers with key-lock for enterprise-grade security
IT PRO TRUSTED RELIABILITY - Backed by 2-year warranty & 24/5 multilingual tech support
TRIPLE DRIVE HOT SWAP POWER - Maximize uptime by swapping 3 drives without shutdown
OPTIMIZED THERMAL MANAGEMENT - Vented aluminum enclosure plus adjustable fan to keep drives cool
UNIVERSAL SAS SATA COMPATIBILITY - Seamlessly supports SATA I/II/III & SAS I/II drives

The StarTech.com 3-Bay Hot Swap Backplane transforms two 5.25in bays into a high-performance, trayless mobile rack supporting three 3.5in SAS II/SATA III hard drives at 6 Gbps. Its aluminum vented design with fan control ensures optimal cooling, while secure ejection levers and key-locks provide enterprise-level drive management. Ideal for IT professionals demanding fast, flexible, and reliable storage expansion with 2 years warranty and expert support.

Specifications

ASIN	B00HS23QZO
Best Sellers Rank	#174 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 Kilograms
Manufacturer	StarTech.com
Memory Storage Capacity	6 GB
Mfr Part Number	HSB3SATSASBA
Model Number	HSB3SATSASBA
Supported Devices Quantity	3
UPC	065030855297
Unit Count	1.0 Count
Warranty Description	2 Years

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$U9520

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Uruguay.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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