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Item#: N82E16817198058

ICY DOCK FlexCage MB975SP-B Aluminum / Plastic 3.5" & 5.25" Black SATA Tray-less 5 x 3.5" HDD in 3 x 5.25" Bay SATA Cage

  • 3.5" & 5.25"
  • Aluminum / Plastic
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Introducing the FlexCage MB975SP-B, a 5-in-3 Tray-less SATA 6Gbps HDD Cage for 3.5" SATA hard drives. The FlexCage focuses on maximizing storage density, while using the least amount of 5.25" device bays possible. To complement the device, the FlexCage uses features such as: Elegant plug & play Tray-less design, replaceable 80mm cooling fan, 3 speed fan control with Smart Cooling Technology, and full control of your drive with individual power buttons. With a large density of drive storage, it can be used in consumer, enthusiast, and system integrator systems that hot swap drives frequently. The FlexCage is compatible with most gaming / media / server computer cases, and it is perfect for file server application such as unRAID, Windows home server and others.

Learn more about the ICY DOCK MB975SP-B




3.5" & 5.25"
Aluminum / Plastic
Internal Interface
80mm ball bearing fan with 2 or 3 pin connector

Dimensions & Weight

8.27" x 5.75" x 4.96"
3.07 lbs.

Quick Info


  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years

Customer Reviews of the ICY DOCK MB975SP-B

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  • Mark S.
  • 8/21/2014 1:06:57 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsConcept good, execution poor

Pros: +5 in 3 form factor is great
+Individual trayless slots are good
+Individually powered slots

Cons: -Poor build quality overall
-Very difficult to get drive to engage pwer/SATA connectors in two slots
-Door latches very flimsy
-Hard drives are being recognized sporadically

Other Thoughts: I am in the process of obtaining an RMA and will update this review with my opinions and rating after working with a second unit. I still love the concept, hoping I just have a lemon.

0 out of 2 people found this review helpful. Did you? Yes No

  • Andrew R.
  • 7/31/2014 7:21:50 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsWorks good, however drives tend to slide back out when unhooking

Pros: I'm using this adapter to mount 2 ssd boot drives in a norco 450b case. This adapter easily allows mounting of the 2 drives and doesn't require any screws to mount the drives.

Cons: Since the drives do not require screws to mount they can just slide back out the back when pulled on!

Because of this I half to be careful when going to unhook the power and sata cables from the drives because the drives want to pull right out of the adapter!

0 out of 1 people found this review helpful. Did you? Yes No

  • Thomas B.
  • 10/18/2013 9:39:07 AM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsWorks well

Pros: Cooling is a con, as it is barely adequate, but I'm listing it as a pro, also. It's as good as it can be considering the 5 in 3 and they've even added an auto-ramp fan speed mechanism to reduce noise. I don't thing better is possible.
Overall, this device does a good job, looks decent, and is well designed. I will buy more of these.

Cons: The doors are flimsy. They don't always catch properly because the doors bend to either side of where the striker mechanism resides. Cooling is not great but probably as good as can be expected for a 5 in 3 and good enough.

Other Thoughts: 5 in 3 is not the best idea. When you need it, you need it, but consider something like the Norco RPC-4020 (or similar) if you need a bunch of drives.

1 out of 1 people found this review helpful. Did you? Yes No

  • Han L.
  • 8/14/2013 4:39:51 PM
  • Tech Level: Average
  • Ownership: 1 week to 1 month

5 out of 5 eggsdecent product

Pros: +tray-less design
+standard fan
+fan control
+space saving design

Cons: n/a

Other Thoughts: if you want to have the highest hard drive density and cool design
this is one to pick

1 out of 1 people found this review helpful. Did you? Yes No

  • Anonymous
  • 6/30/2013 9:36:35 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

2 out of 5 eggsNot Worth the Price

Pros: +Sata III.
+No need for drivers.
+Detect 4TB hard drives.
+Generic replacable fan.
+Individual power button on the 5x bays
+Fan speed control switch

Cons: -Bad built Quality overall
-Hard to install hard drives (see below)
-Bay 'door' easily broken
-Hard drive getting hot after long period of usage still an issue
-Many more little nit pick in quality...

Other Thoughts: Bought this to replace an old Sata II 4x bays. Wish I didn't...

Hard for me to explain all this with my bad english but hope it help others to know what their gonna get ...

Hard drives was hard to install. Sliding in the hard drive and then closing the bay's 'door' should push the drive inplace. Thats not the case however, as only (1) of my hard drive fit like that. The 'door' won''t snap close for the rest of my drives!! Many attempts later with frustration, I use a screw driver to push the drive to see if it's all the way in already, it worked. The hard drive went in further. So the 'door' design wasn't strong enough to force the hard drive inplace to connect the Sata and Power. Had to use a screw driver (as my fingers won't fit) to push the drive in further while the 'door' had to be half closed. =/

Also the 1st bay (from the right) was even harder to install my drive to. It was too 'tight'. It didn't slide in smoothly, had to use further force just to slide it inplace. Because of that when took out the drive, the bay 'door' broke!! When you open the door, the bottom piece pushed a 'lever' to push the drive out. But it's connected by plastic, so the plastic piece broke. The bay 'door' is now held in place by .. tape =/

So overall, very bad experience. Now I need extra tool just to install drives, and be extra extra careful not to break the rest of the other bay doors. And as for the 1st bay, If I need to take the drive out, I would have to first take out 2nd bay drive, that would give me enough room to put my hand in to pull out the 1st drive ... so frustrating ... so much for easy plug and play hot swap drives... =(

9 out of 13 people found this review helpful. Did you? Yes No


Pros: Just to clarify i do not own this item yet. I am looking forward to using it in an upcoming build. This is an Internal backplane/drive cage, it is NOT an external enclosure for running HDD's outside of the system. Icy Dock makes great items and this one looks to be another home run:
Full metal housing
no separate drive cages, just open and pop in the drive
Replaceable/upgradable cooling fan, (can take any 80mm 2 or 3 pin fan)
Massive capacity (4TB Support x 5 drives)
No ancient molex connectors, all 15pin SATA power connectors

Cons: Dont know yet, will update when i get one of these. (hopefully soon)

Other Thoughts: Looks to be good on paper, cant wait to try it. and again

Good luck with your build if you get one!!

3 out of 18 people found this review helpful. Did you? Yes No

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