FlexCage MB974SP-B
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Introducing the new face of Icy Dock screw-less technology, the FlexCage MB974SP-B 4-in-3 SATA Backplane. This product allows the user to install 4 x 3.5” SATA hard drives into a computer case’s 3 available 5.25” device bays. Using our world renowned screw-less technology, no screws or tools are required to insert or eject the drives making hot swapping a completely hassle free experience.

The front of the device includes childproof power buttons for each drive which require the button to be pressed slightly deeper than normal to ensure that a drive is not accidentally turned off by bumping into it or rubbing against it. These power buttons also act as an LED indicator showing drive power and activity. Similarly, each drive door has a multi-locking latch mechanism to prevent a door from being opened easily, making it an ideal solution for systems where IT and non-IT personnel have access. Also on the front are USB and eSATA ports to quickly and easily connect external storage peripherals, especially useful for cases that do not have front/top port access.

On the rear of the MB974SP-B is a monster 80mm cooling fan to pull cool air from the front ventilation slots, over the drives, and exhaust the warm air out through the rear ventilation slots. The fan also features an “on-demand” power system, so that the fan is only powered on if a drive’s power is on. So even if all 4 slots are filled, the fan will only spin if one of the drives is powered on. And if the included fan is not enough, it can be upgraded to use most aftermarket 80mm case fans that use a 2 or 3 pin connector, giving the user a wide range of choices according to their preferences. To further the user’s customization, a 3 speed fan control is built in letting the user choose between high, low, or auto. The auto setting uses our Smart Cooling Technology to adjust fan speed according to the cooling requirements of the drives. An internal SATA cable and USB header connector are also built into the rear for easy connection to the systems motherboard or add-on card.
* Fits 4 x 3.5” SATA HDD into 3 x 5.25” Device Bays
* Support SATA 3 (6 Gb/s) hard drive
* Screw-less, tool-less design for genuine plug &play and hot swap use
* Stylish aluminum body construction for durability and heat dissipation
* 80mm cooling fan for maximum air flow
* On-demand power system - Fan power only when a drive is powered on
* Fan is replaceable with aftermarket fans that use 2-pin or 3-pin connectors
* 3 speed fan control including Smart Cooling Technology providing temperature
* Front and rear ventilation slots
* Front side USB and eSATA ports for convenient external storage connections
* Individual power switches and LEDs for each drive
* Child-proof power buttons to avoid accidental power shut down
* Multi-locking door latches to prevent accidental drive ejection
* Internal SATA cable and USB header cable built into rear of device
Video Introduction:
3 Years Warranty

ICY DOCK FlexCage MB974SP-B Tray-less 4x 3.5” HDD in 3x 5.25” Bay SATA Cage - Front USB + eSATA Port
Model Number :
Color :
Drive Fit :
3.5“ SATA 1.5 / 3 / 6 Gbit/s hard drive x 4
Host Connection :
7pin SATA port x 4 for HDD
7pin SATA connector x 1 for front Panel eSATA port
5pin USB 2.0 connector x 1 for front Panel USB port
Device Space :
5.25" half height device bay x 3
Transfer Rate :
Up to 6 Gbit/s. (depending on hard drive speed)
Power Input :
15pin SATA power port x 2
Insert& Extract connection Via :
Direct SATA hard drive connection
Front Panel Contents :
eSATA Port x 1 & USB 2.0 Port x1
Adjustable fan speed control (High/Low/Auto)
Structure :
Aluminum body w/ partial plastic
Drive Cooling :
Removable rear outtake fan w/ aluminum heat dispersion
Cooling Fan Type :
80mm ball bearing fan with 2 or 3 pin connector
Power Indicator :
Blue LED
HDD Access Indicator :
Flashing blue LED
Dimension (L x W x H) :
210 x 148 x 126mm
Weight :

Purchase Link:




ICY Tip:
July 2013

Build a DIY FreeNAS, unRAID and WHS NAS
Media Center with ICY DOCK Hard Drive Cage Module
April 2013

Build a Premium and Hot-Swappable
Gaming or Media Storage Tower Case Using
the FlexCage Tray-Less HDD Cage
December 2011

Restore New Life Into Your Older Hard Drives to
Maximize Available Free Space
May 2011

Best hard drive module for silent PC / gaming system


Product Review:
Written by Tom Brokaw

Created on 30 August 2012

"Without a doubt IcyDock has brought amaizing products to the market that any consumer should be proud to own.

We had no performance issues and it is really a no brainer that IcyDock is the way to go!"

Date: 2011-09-6

Author: Brian

"The Icy Dock 4-in-3 internal RAID backplane does what it's supposed to do, a common refrain when looking at Icy Dock products. We found it to be reliable, intuitive to use and hard to find much fault with."

Date: 2011-05-20

Author: Josh Cox
Edited by: Aditya Gune

"Through various tests the Icy Dock MB974SP-B performed quite well in terms of ease of use and function as well as speed. Having the ability to quickly change out hard drives is very useful and that is precisely what this product offers. Perhaps the nicest feature Icy Dock included is the safety and security systems that prevent accidental shutdowns; no longer will users have to worry about accidentally hitting a button and crashing their computer."

April 28, 2011

Author: Bob Buskirk

"If you need extra storage space in your system the MB974SP-B is the perfect thing."

Product Reviews
Published on Jan 31, 2013
By HiTechLegion
ICY DOCK FlexCage MB973SP-B / MB974SP-B Trayless SATA Backplane Unboxing + Overview + Benchmarks
Link to video: https://www.youtube.com/watch?v=e6RPEtCVbAc


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