Can you replace rear fan with quiet aftermarket?

I went as far as to buy a 80 mm to 120 mm adapter and stick an ultra quiet 120 mm fan. The result is exactly what I wanted -- quiet running, more air drawn over the drives, and cooler drives.

Is trayless or ones with trays better for minimizing rattles and vibration?

I can't answer the vibration or rattle comparison, but I have had this unit since Oct. 2014, and have had no issues with the unit or hard drives going bad? I am using in a home server running 24/7. I bought it in case I needed to swap drives, but i haven't had to yet...

Does this work with 6tb western digital red hard drives?

works with any SATA or SAS hard drive (obviously you must connect the drive bay to a Sata or Sas controller). We use western digital RE drives and one thing you need to be aware, once you insert the drive, you need to open the door slightly and push drive firmly unto the backplane with your thumb, then reclose the door. This ensures a square and fully inserted drive onto the backplane.

Do i need a separate power supply cable?

Yes, you can run one cable from the PSU peripheral to the cage. But be ware, do not daisy chain more than one cage (if you buy more than one). Each drive can consume up to 10-12 Watts depending on your drive, and say another 2 watts for the fan itself, and you are getting close to the 56 Watt limit for a line on the PSU/SATA spec.

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Description

💼 Elevate your data game with hot-swap power and pro-grade cooling!

COOL UNDER PRESSURE - Vented aluminum enclosure with speed-controlled fan keeps drives reliably cool and failure-free.
BLAZING DATA THROUGHPUT - Experience enterprise-grade 6 Gbps transfer rates with full SATA III and SAS II compatibility.
MAXIMIZE STORAGE AGILITY - Transform 3x 5.25" bays into 4 hot-swap 3.5" drive slots for seamless upgrades.
SECURE EFFORTLESS ACCESS - Trayless design with individual ejection levers and key-lock ensures quick, safe drive swaps.
IT PRO ENDORSED RELIABILITY - Backed by 2-year warranty plus free lifetime 24/5 multilingual tech support for peace of mind.

The StarTech.com 4-Bay Mobile Rack Backplane converts three 5.25" bays into four hot-swappable 3.5" SATA III/SAS II drive slots, delivering up to 6 Gbps transfer speeds. Its trayless design with secure key-lock and individual ejection levers streamlines drive management, while the vented aluminum chassis and built-in fan ensure optimal thermal performance. Designed for IT professionals, it offers broad compatibility, robust reliability, and dedicated technical support.

Specifications

Item weight	1.28 Kilograms
Memory storage capacity	6 GB
Compatible devices	Desktop
Hard disk form factor	5.25 Inches
Max number of supported devices	4
Data transfer rate	750 Megabytes Per Second
Global Trade Identification Number	00065030859547, 05057454485711, 07426800234200
Manufacturer	StarTech
UPC	650308595472 650361661282 065030859547 012305135486
Product Dimensions	19.7 x 14.6 x 12.6 cm; 1.28 kg
Item model number	HSB4SATSASBA
Series	HSB4SATSASBA
Form Factor	5.25-inch
Processor Count	1
Hard Disk Description	External
Hard Drive Interface	SATA 6 GB/s
Operating System	HSB4SATSASBA
Are Batteries Included	No
Lithium Battery Weight	3 kg
Item Weight	1.28 kg
Guaranteed software updates until	unknown

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