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ICY DOCK MB991SK-B ToughArmor 2.5 SATA HDD SSD
- Black
- 1 x 2.5" Drive to 3.5" Bay
- SATA I/II/III
ToughArmor MB991SK-B 2.5” SATA Mobile Rack for 3.5" Device Bays
Introducing the Icy Dock ToughArmor MB991SK-B 2.5" SATA Mobile Rack solution for use in 3.5" device bays (Floppy bay). It is a smaller form factor device built specifically for systems with small real estate to work with. Using a heavy duty metal construction, it is capable to withstand the harshest enterprise type environments. The drive is fully secured by our proven technologies such as, the Eagle-Hook lock system and metal 2-segment safeguard key. Our full metal EZ Slide Mini Tray allows interchangeability of data between multiple systems with other ToughArmor products. Suggested applications in Medical & Military systems, Media servers, and IPCs, approved by Tier 1 companies.
Efficient Space Use
The MB991SK-B is perfect for use in industrial PCs, SMB SFF servers, mobile DVR systems, or even home servers. These systems tend to use components that provide the needed features, in the smallest form factor available. The ability to house one SATA SSD or HDD in a single 3.5” bay makes it a valuable asset in specific applications such as, integration into an industrial imaging or medical device.

Full Metal Protection
Making sure that the material used is designed in a way where it can be relied upon for many years after its deployment. The MB991SK-B is capable of holding up in the harshest environments, with the heavy duty metal construction throughout the entire device. The ToughArmor’s full metal design is perfect for industrial devices that may require a flammability rating as the full metal material is considered to already comply with flammability requirements. So because of the high build quality, it can be used various enterprise systems including: military and law enforcement deployment, as well as manufacturing conditions such as embedded control systems and factory automation systems including: military and law enforcement deployment, as well as manufacturing conditions such as embedded control systems and factory automation systems.

The full metal design also allows heat dissipation transfer from the hard drives throughout the mobile rack. In addition, Multi-Flow Technology effectively routes air flow correctly for excellent passive cooling in key ventilation slots on the front, rear, top and bottom. Lastly, Anti-Vibration Technology and EMI Grounding are used to provide a stable environment for the hard drives or SSDs used to perform at its best.

Convenient Utility & Accessibility
The front of the ToughArmor includes a status LED when the drive is powered on, off and accessed. Active Power Technology (APT) allows the status LED to be on only when a hard drive is inserted into the enclosure. For drive security, the eagle-hook lock system on the tray makes sure your hard drives will not eject when not needed. Additionally, the 2 segment key lock provides extra protection to theft of hard drives as well as safeguards any sensitive data.

The EZ Slide Mini trays make drive interchangeability and maintenance completely hassle free, in case of a hard drive failure. With a simple swap of the hard drive, your overall down time is greatly reduced especially if this occurs when it is time sensitive. The trays are also designed to accommodate 7 to 15mm height hard drive and SSD, creating a 2.5" hot swap bay for any standard SATA hard drives and SSDs. While the tray is not installed to the MB991SK-B, the Anti-Dust Flap feature helps prevent dust from entering into the mobile rack.

- Heavy duty full metal construction with suggested applications in Imaging, Medical, and Military systems, Media servers, and IPCs, approved & used by Tier 1 companies.
- Fits 1 x 7mm to 15mm 2.5” SATA drives/ SSDs in a 3.5” floppy drive bay.
- Heavy Duty Full Metal construction, perfect for enterprise applications.
- Multi-Flow Technology - provides excellent passive cooling.
- Anti-Vibration Technology - creates a safe environment for hard drives or SSDs.
- Active Power Technology (APT) - individual led only powers up if there is drive installed in the drive bay.
- EMI Grounding – protects hard drives from electrical damage.
- Eagle-hook lock system & 2-segment safeguard key lock keeps drives secure within the enclosure.
- Anti-Dust Flap prevents dust from entering when device not used.
- Removable EZ Slide Mini Tray system for easy maintenance.
- Supports SATA 6Gbps and hot swap.
- Single SATA 15 Pin to power entire device.
Model Number: | MB991SK-B |
Color: | Matt Black |
Host Interface: | Single 7-pin SATA |
Drive Fit: | Single 2.5" SATA I / I I/ III HDD / SSD (7-15mm Height Drive) |
Drive Bay: | 3.5" Floppy drive bay |
Transfer Rate: | Up to 6 Gbps (depending on hard drive speed) |
Power Input: | Single 15-pin SATA power port |
Insert & Extract Connection Via: | Direct SATA hard drive connection |
Structure: | Full Metal |
Drive Cooling: | Metal heat dispersion |
LED Indication: | Device Power & Drive Activity |
LED Color: | Green: Device Power; Amber: Drive Activity |
Drive Security: | 2-Segment key lock |
Dimensions (L x W x H): | 5.32 x 4.0 x 1.01" |
Weight: | 0.88 lbs |
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MB991SK-B | MB991IK-B | MB992SK-B | MB994IPO-3SB | MB994SP-4SB-1 | MB994SP-4S | MB994SK-1B | MB996SP-6SB |
ToughArmor | ToughArmor | ToughArmor | ToughArmor | ToughArmor | ToughArmor | ToughArmor | ToughArmor | |
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Number of 2.5" HDD/SSD Supported | 1 | 1 | 2 | 2 | 4 | 4 | 4 | 6 |
Supports 2.5" SATA HDD/SSD | ![]() |
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Supports 2.5" SAS HDD/SSD | ![]() |
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Supports SATA 6Gbps | ![]() |
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Supports SAS Dual Channel |
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Supports 1x Slim ODD Drive |
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7 - 9.5mm Drive Height | ![]() |
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12.5 - 15mm Drive Height |
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Fits in 3.5" Floppy Bay | ![]() |
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Fits in 5.25" Device Bay |
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Lock on Each Drive Tray | ![]() |
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UL Listed | ![]() |
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Full Metal Construction |
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Designed for Enterprise | ![]() |
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Hot Swappable | ![]() |
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Active Power Technology (APT) | ![]() |
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Warranty & Returns
Warranty, Returns, And Additional Information
Return Policies*
- Return for refund within: 30 days
- This item is covered by BeachAudio Return Policy
- *Subject to applicable law
Manufacturer Contact Info
- Manufacturer Website
- Support Phone: 1-626-956-8800
- Support Email: tech@icydock.com
- Support Website
- View other products from ICY DOCK
Pros: Nice all metal construction and this is the locking version so you can't accidently push the front tab and eject the drives. Install was simple and it fit 5.25" slot perfectly. I'm using this with 4 Samsung 850 EVO 1TB drives in raid 0 to have a 4TB drive used for a number of VMware VM's that are doing continuous builds for software development.
Cons: This would be a GREAT unit if it had good fans - but alas - they put in lower quality fans. Combo ball / sleeve bearing and they are simply not quiet at all. If you have this in a rack system where you don't care about noise - then the noise is not much of an issue but from the sounds I am starting to hear - I don't think the lifespan of these is that great. Come on Icy Dock - for something like this unit - users will pay the extra $10 to have better fans - heck I have $1800 in drives installed so I would pay a bit more to have high quality fans that are not so loud. I ended up purchasing from Digi-Key a couple of OD4010-12LB fans and putting them in myself (and thus voiding the warranty but I'm ok with that). Much better - virtually quiet.
Overall Review: The locking mechanism is not for security - it is just to prevent accidental removal of a drive. Anyone with the smallest of tools or a key could force the tab open (bending the tab and making that tray unusable) so consider what your application is. But this is better than other units that have plastic locks. Again - if it came with better fans - 5 eggs. If you don't need heavy usage then consider this 4 eggs. But the fans supplied are simply not up for 24/7. The ones I replaced it with are rated for about 7 years of 24/7 usage but I did have to do some simple soldering - which to me is no big deal.