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Drobo DDR3A21 Diskless System Network Storage

  • Desktop Scalable Storage Array
  • 1 x USB 3.0
  • Holds 4 x 3.5" SATA HDDs (not included)
  • Hot Swappable Drives
  • Battery Backed Memory
  • Any Drive Manufacturer or Speed

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  • Specifications
  • Warranty & Returns
  • Reviews

Learn more about the Drobo DDR3A21




Port USB
1 x USB3.0
HDD Interface
4 x 3.5" SATA (4 x Bay)


Form Factor
Operating System
Mac OS X 10.7. or higher
Windows 8/8.1 32 and 64 bit
Windows 7 32 and 64 bit

Hard Drive Performance

Included HDD Capacity
Diskless System


External Power Supply:
AC Input: 100 - 240VAC~2A, 50 - 60Hz
DC Output: 12V, 12.5A, 150W max


Desktop Scalable Storage Array

Hot Swappable Drives

Battery Backed Memory

BeyondRAID Features
-Thin Provisioning
-Instant Expansion
-Mixed Drive Size Utilization
-Automatic Protection Levels
-Dual Disk Redundancy
-Virtual Hot Spare
-Data Aware
-Drive Re-ordering

Additional Software Features
-Drive spin down
-Dim lights

Hardware Features
-Carrier-less drive bays
-Power fail protection
-Kensington lock port For security (lock not included)

Dimensions & Weight

10.7"(D) x 6.3"(H) x 5.0"(W)

Package Contents

Package Contents
2 m (6.6 ft) USB 3.0 cable
1.8 m (6 ft) power cord with power supply
Quick Start Card
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details

Customer Reviews of the Drobo DDR3A21

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  • Guy H.
  • 6/4/2015 6:36:04 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month

1 out of 5 eggsProduct Improvement Required

Pros: Attractive Design

Cons: Only USB 2 throughput
Not totally compatible with windows 7

Other Thoughts: After calling Drobo, I loaded two 6 terrabyte drives in the Drobo. That went well.

Three items prompt the 1 star review.

1. Windows claims 15.9 TB capacity. It should claim less then 6 TB capacity. Clearly the Drobo firmware doesn't understand the windows interface. This product was released more than a year ago. This should have been fixed long ago.

2. The USB 3.0 specification supports transfer speeds up to 625 MB/s. The Drobo, as configured, supports only 40 MB/s. That is not what I purchased! Other reviewer's have reported drive incompatibility issues. This, again, links to a Drobo firmware or design issue. I see no reason to purchase different drives in the perhaps vain attempt for better throughput.

3. There are many other sour reviews echoing my sentiments.

So rather than waste more time and money on a poorly designed device, I'll simply sell it and move on.

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

  • Scott S.
  • 5/28/2015 9:32:31 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggsDisapointed

Pros: Good unit for setting up as a NAS in your home or office for storing and sharing media. Multiple RAID functions. Large drive support.

Cons: Down side, If you have a 1st Generation Drobo. Make sure to have your data backuped to another media. There is an issue with newer Drobo systems not recognizing the RAID from an older unit.

Order this unit for a customer after his 1st gen Drobo crashed. Setup the new unit, installed the dives, but no data. After doing some research found out that the newer units will not see the RAID config of the older ones.

Other Thoughts: Make sure that if you have a 1st gen Drobo to make a backup of your data before setting up the new unit.

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

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  • 2+ $273.41 ea.

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