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The FatCage MB901SPR-B is a dual bay RAID enclosure that supports 2 x 2.5” or 3.5” SATA hard drive or SSD in a 2 x 5.25” optical drive bay of your computer/workstation system. With the built-in hardware RAID 1 chipset and easy to read RAID status LED indicators, you can conveniently mirror the 2.5” drives for data redundancy without adding a RAID card or RAID monitoring software on the host end. Also, Central Process Unit (CPU) is normally required to calculate a RAID but, alternatively, having a RAID chipset on the enclosure frees up the CPU overhead and speeds up the whole system. Therefore MB901SPR-B is a perfect removable drive enclosure for mission-critical computer systems that not only make your system work faster but also provide protection against your critical data.
Built-In RAID 1 (Safe Mode)
With the built-in JMS562 hardware RAID chipset, you can effortlessly add two HDD/SSD RAID array to any system without needing a RAID controller card. The FatCage RAID MB901SPR-B automatically mirrors 2 x 2.5” or 3.5” SATA HDD/SSD for data redundancy to prevent system downtime caused by a single hard drive failure.
Advanced RAID Status LED Indicators

The FatCage RAID MB901SPR-B is equipped with easy-to-read RAID status LED indicators for RAID health monitoring during the operation so users can quickly grasp the live RAID status without installing the RAID monitoring software. However, if your application requires using RAID monitoring software, it is available for download and installation on Windows/Mac computers.

Note: An optional RAID monitor software is available to download [here] . Supporting both Windows and Mac. 

EZ-Tray Removable Drive Trays

The FatCage RAID MB901SPR-B features removable EZ-Tray drive trays, allowing the user to install or remove drives without opening the computer case or powering off the computer. The EZ-Tray supports both 2.5" SSD/HDD and 3.5" hard disk drive and compatible with FatCage and DataCage enclosures include DataCage MB876SK-B (1x Drive), FatCage MB153SP-B (3x Drive), and MB155SP-B (5x Drive). This allows you to continue using the same trays from these enclosures and exchange drives between systems without unmounting the drive from the tray.

EMI Grounding
Making sure your drives are properly grounded is important, especially through many drive swaps. Without it, there is a high possibility that there may be static shocks that could damage your drives or may result in losing your important data. Our EMI grounding technology ensures a stable and safe environment for the HDD/SSD used, which improves reliability.
Packed with Features
Large ventilation holes are placed around the enclosure to work alongside your system’s cooling system to keep your drives at optimal temperatures.
The MB901SPR-B supports 15 pin power cables with locking latches, so you will never need to worry about the cables unintentionally discounting from your enclosure. Once the cables are connected, they will stay in place
ICY DOCK RAID enclosures come with a variety of options and specifications to choose from, including dual 2.5” or 3.5” drives for 5.25” optical bay, dual 2.5” drives for external 3.5” drive bay and dual 2.5” drives that fit into 3.5” HDD bay. Whether you are looking for an ultra-compact RAID enclosure or an advanced RAID enclosure, ICY DOCK has your back!
ICY DOCK SSD/HDD RAID Enclosures for 5.25” Optical Drive Bay
Dual 3.5” SATA HDD + HW RAID-1 w/ Advanced RAID status Indicators – MB901SPR-B
Dual 2.5” SATA HDD + HW RAID-1 w/ Advanced RAID status IndicatorsMB902SPR-B
ICY DOCK SSD/HDD RAID Enclosures for External 3.5” Drive Bay
ICY DOCK 2.5” SSD/HDD to 3.5” HDD RAID Adapter for 3.5” HDD Bay
Dual 2.5” SATA SSD/HDD + HW RAID-0/1/BIG/JBODMB982SPR-2S R1 (special order only)
Drive Tray
Key Features
Supports 2 x 2.5” or 3.5” SATA HDD/SSD
Installs into any standard external 2 x 5.25” optical drive bay
Supports up to 6 Gbps data transfer speed
Built-In JMS562 hardware RAID 1 mirroring (SAFE) chipset
Easy to read RAID status LED indicators for drive power, access, fail, and RAID 1 rebuilding process supports SATA and 15-pin power cable with locking latch design
Anti-Vibration Technology (AVT) – reduces noise and protects against environmental damage
* Active Power Technology (APT) – saves power by shutting the device down when no drive is installed
Industry-leading 3-year warranty against all defects
Complimentary support from professionally trained US-based technical support agents
3 Years Warranty
Model Number :
Color :
Black + sliver
Support Drive Size :
2 x 2.5”/3.5” SSD/HDD
Compatible Drive Type :
Number of Drives :
Max Drive Height :

2.5" HDD/SSD up to 15mm height
3.5" HDD up to 26.1mm height

Drive Bay :
2 x external 5.25" drive bay
Host Interface :
1 x SATA 7pin
Power Input :
2 x 15pin SATA power connector
Transfer Rate :
Up to 6G/bs. (Depending on hard drive speed)   
Support HDD Capacity :
No Limitation
Drive Cooling :
Metal heat dispersion
Support Hot-Swap :
RAID Function :
Controller IC :
JMicron – JMS562
Structure / Material :
Metal with partial plastic ABS
Dimension (W x H x L) :
146.4 x 85.8 x 200.4mm
Product Net Weight:
Package Gross Weight:
Supported Operating System:
Windows 10, 8.1, 8, 7 and Vista
RAID 1 Status LED Indicator:

RAID 1 configuration is normal: solid green Degraded RAID 1: LED off

Rebuilding Progress LED Indicator:
Divide the progress into four stages: Flashing green
HDD Fail LED Indicator:

HDD fail: solid red in corresponded device slot
Double source: solid red in both device slots
Capacity error: Solid red in the device slot which has smaller capacity drive

Double Source LED Indicator:
Double source: solid red
Capacity Error LED Indicator:
Capacity error: solid red
Drive Activity LED Indication:

Empty bay: LED off
Drive power: solid green
HDD fail: solid red
HDD access: flashing green

Package contents:
Device, User Manual, Screws
SATA Connector Insertion Rate:
5%~65% RH
Operating Temperature:
0°C to 60°C (32°F to 140°F)
Storage Temperature:
-35°C to 70°C (-31°F to 158°F)
3 years



Frequent Asked Questions

Q: What is RAID and what are different mode?

Note: Not all ICY DOCK enclosure support each of the RAID modes described below. For more information on the RAID modes that your enclosure supports, refer to the manual or the icydock.com product page.

Redundant Array of Independent Disks (RAID) is a virtual disk technology that combines multiple physical drives into one unit. RAID can create redundancy, improve performance, or do both.

RAID should not be considered a replacement for backing up your data. If critical data is going onto a RAID array, it should be backed up to another physical drive or logical set of drives.


The following are terms that normally used in connection with RAID:

• Striping: data is split between multiple disks.
• Mirroring: data is mirrored between multiple disks.
• Parity: also referred to as a checksum. Parity is a calculated value used to mathematically rebuild data.
Different RAID levels exist for different application requirements.

Refer to the following table for the list of RAID modes offered by some ICY DOCK products:
RAID MODE Description Operation Advantages Disadvantages Recovery
RAID 0 Striped disks Data is split evenly between two or more disks. Large size and the fastest speed. No redundancy. If one or more drives fails, this results in array failure.
RAID 1 Mirrored disks Two drives have identical data on them. A single drive failure will not result in data loss. Speed and size is limited by the slowest and smallest disk. Only one drive is needed for recovery.
JBOD Just a Bunch Of Disks Any number of drives are accessed independently by the operating system. Software RAID modes can be used. Hardware RAID may have better performance. N/A
BIG Spanning or Concatenation Data is written on one drive until it is full, and then the next drive(s) until it or they are full. Creates a very large and simple array. No redundancy. N/A

Q: How do I rebuild my RAID 1 array?

1. Determine which drive is operational by using the RAID monitoring software (if available) or test each drive individually on a different hard drive enclosure or by connecting each drive directly to a computer’s SATA port.
2. Replace the failed drive with an identical hard drive.
3. The array will rebuild and is accessible during the rebuilding process.

Note 1: It is recommended to use a new identical hard drive for the rebuild. To use a used drive, we recommend use Window’s DiskPart command to clean and format the used hard drive before you start rebuilding.

Note 2: Before you start the rebuilding process, make sure the replacement drive has no previous RAID table in it.

Q: Everything is connected, but nothing is working. What do I do?

When you troubleshoot issues with a hard drive enclosure, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:
• Cables (USB, SATA, SAS, Mini-SAS, etc)
• Hard drives / SSD (M.2 drive, 3.5'' hard drive, solid state drive, etc)
• Hard drive enclosure (converter, mobile rack, cage, and external enclosure)
To test your setup components, try the following:
• Connect the hard drive directly to the system or use the hard drive in another enclosure to see if the problem is with the hard drive.
• Use the cables, hard drives, and hard drive enclosure in another setup to see if the problem is with the components or the setup.
• Use a different cable, hard drive, and hard drive enclosure in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.
When you test the hard drive and hard drive enclosure, it is recommended that you do the following:
• To check Disk Management, press the Windows key + R, type diskmgmt.msc, and press Enter. Check to see if your hard drive is listed.
• If the hard drive is listed with unallocated space, the hard drive needs to be reformatted. Right-click unallocated and click New Simple Volume. Follow the on-screen instructions to complete the reformatting.
Note: Formatting a hard drive erases all of the data on it. Make sure that you back up all of your data before you reformat the hard drive.
• If the hard drive is listed as healthy but does not have a drive letter, for example, C:, right-click healthy and click Change Drive Letter and Paths. Click Add, assign a drive letter, and click OK.
Note: A formatted hard drive will not show up in Computer or My Computer until it has a drive letter assigned to it.
For additional help with setting ICY DOCK RAID enclosure, please contact us by email, phone, or live chat.



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