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Mediasonic ProRaid H8R2-SU3S2 RAID 0 / 1 / 3 / 5 / 10 / 50 8 3.5" Drive Bays USB 3.0 / eSATA 8-Bay External Hard Drive Enclosure

  • SATA I / II / III
  • 8 3.5" Drive Bays
  • RAID 0 / 1 / 3 / 5 / 10 / 50

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Mediasonic H8R2-SU3S2 ProRaid Eight-Bay 3.5" SATA Hard Drive Enclosure - USB 3.0 SuperSpeed & eSATA

Mediasonic H8R2-SU3S2 ProRaid is a Eight-Bay enclosure for 3.5" SATA hard disk drives. It has hardware embedded RAID to support Raid 0 / 1 / 5 / 10 / 50.


  • Supports all brands of 3.5" SATA I / II / III hard disk drives up to 4TB per drive, and up to 8 x 4TB.
  • Hardware RAID controller built-in on-board
  • Compatible with Macbook USB 3.0
  • Transfer rates up to 5.0Gbps via USB 3.0
  • Transfer rates up to 3.0Gbps via eSATA
  • Power Sync: Powers off in sync with PC
  • Forced Convection Process
  • Smart Fan function
    • Thermal-Sensor built-in
    • Auto & Manual mode
    • Three levels of speed

  • One button interface selection: Switch USB 3.0 or eSATA interface by pressing one button
  • Raid Mode Support
    • Raid 0 (Spanning) JBOD
    • Raid 0 (Striping)
    • Raid 1 (Mirroring)
    • Raid 3 (Striped set with dedicated parity)
    • Raid 5 (Striped set with distributed parity)
    • Raid 10 (Mirroring + Striping)
    • Raid 50


  • Interface
    • USB 3.0
    • eSATA

  • Supporting OS
    • Windows XP / VISTA / Windows 7 / Windows 8 (with MBR enabled, supports total capacity up to 2TB)
    • Windows Vista / 7 / 8 (32- / 64-bit) (with GPT enabled, supports total capacity more than 2TB)
    • Mac OS 10.3 or later
  • Power Adapter: 100V to 240V
  • Dimensions (H x W x D): 13.8 x 6.1 x 10 inches (352 x 155 x 253mm)
  • Weight: 11lb (5.0kg) (excluding hard drive)
  • Safety Specification: CE / FCC / RoHS
  • Product Origin: Taiwan



What's in the Box

  • H8R2-SU3S2 Enclosure
  • eSATA Cable
  • USB 3.0 Cable
  • Power cord (US Type)
  • User manual
  • Screw driver x 1
  • HDD Handle x 8

Warranty Information

Warranty Period: 1 Year

Learn more about the Mediasonic H8R2-SU3S2




External I/O
USB 3.0 / eSATA
RAID Levels
RAID 0 / 1 / 3 / 5 / 10 / 50


3.5" Drive Bays

System Management

OS Supported
Windows 2000 / XP / VISTA / Windows 7 (with MBR enabled, supports total capacity up to 2TB)
Windows Vista / 7 32/64 bit (with GPT enabled, supports total capacity more than 2TB
Mac OS 10.3 or later

Mechanical Spec

Power Supply
100V to 240V


RAID Mode Support:
2x Raid 0 (Spaning)JBDO
2x Raid 0 (Stripping)
2x Raid 5 (Striped set with distributed parity)
2x Raid 10 (Mirroring + Striping)

Hardware Raid controller built-in on board

Transfer rate up to 5.0Gbps via USB 3.0

Transfer rate up to 6.0Gbps via eSATA

Power Sync: Power off in synchronization with PC

Forced Convection Process

Smart Fan function

One button interface selection: Switch USB 3.0 or eSATA interface by pressing one button.

Dimensions & Weight

6.10" x 13.86" x 9.96"
11.0 lbs.
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Customer Reviews of the Mediasonic H8R2-SU3S2

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  • Eliot S.
  • 6/17/2015 12:43:03 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsVery Nice Enclosure

Pros: Well-made enclosure, very quiet, very good eSATA transfer speeds.

I needed a Hardware RAID enclosure to house 8 2TB WD green drives I had sitting unused.

This enclosure is attached to my home server (HP Proliant Microserver Gen8) attached to the HP Smart Array P222/512 SAS controller using a Mini SAS to 4 eSATA fanout cable.

Once the enclosure array has been setup the HP configuration utility sees this as a RAID 0 volume which can be added to the supported arrays. Perfect Backup volume, and where many do not like the RAID 50 I’m happy with the added level of redundancy.

Cons: If I hadn’t done one last troubleshooting step I would have filled this section and returned the enclosure.

I could not get the Array to complete a format, tried to do a full format not a quick format. It ran for 5 days before I killed it to look into why it would not complete. Turned out 1 of the 8 drives was defective.

Once removed I tried the 2 RAID 5 config everything worked. Ordered a replacement drive for final setup.

So no Cons…

Other Thoughts: I took a chance on this enclosure as I liked the size drive capacity and price.

I was also looking at a Sans Digital 8-Bay Hardware RAID, but priced at $140.00 more.

I’m very happy with this purchase, and would recommend this enclosure to anyone
I see a lot of the reviews complaining about the inability to RAID 5 all 8 drives. People need to do their homework.

The first thing I did when thinking about this enclosure was to download the user manual. It clearly states that if you want a single Volume RAID 50 is the only option.

As for Newegg, the Spec states 2x RAID 5, no deception there?

Did you find this review helpful? Yes No

  • Canyon H.
  • 4/17/2015 7:35:40 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

2 out of 5 eggsUnreliable

Pros: Capacity, speed

Cons: I'm using a Man, and every time I go to use it, I have to cycle the power of the array. When I cycle the power, it works again. Awfully frustrating.

Manufacturer Response:

Dear customer

thank you for your support with our product, if you have any questions or in need of technical assisstance, please contact our support at or visit our forum at

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  • David B.
  • 3/22/2015 7:17:58 AM
  • Tech Level: High
  • Ownership: more than 1 year

4 out of 5 eggsGood for the price

Pros: Supports RAID 50 which compared to RAID 5 has double the fault tolerance and double the RAID-based speed gains, but only 85.7% the space utilization.

Have had several drive failures due to intense use and it has rebuilt successfully every time.

Cons: Does not actually support RAID 5 across all 8 drives. Only across each layer of 4 drives.

Additionally, I have an issue where file transfer rates are EXTREMELY slow. And there is a 3-5 second pause after each file when transferring groups of large files. This is without a doubt my biggest complaint as I would never use RAID 5 across 8 drives anyway. All drives were tested independently and came up perfectly fine so it's a problem with the unit. One other I recommended the product to does not have this issue, so I may build another unit as my 8x3 TB is needing a serious capacity increase.

Other Thoughts: Main complaint seems to be the lack of support for 8 drive RAID 5. I agree this strikes me somewhat as false advertising, but on the other hand, there is no reason whatsoever that would prompt me or anyone conscious of data integrity to stripe one drive parity across 8 drives.

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  • James P.
  • 3/6/2015 5:48:56 AM
  • Tech Level: Average
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggs8 Bay Raid Enclosure

Pros: Works, have set up as Raid 5, with four of the 8 Bays in a single array. You can set up four hard drives (mine 4 2 TB Seagates) and later you can add another array so you don't have to buy 8 hard drives all at once, Unit is fairly well built, fans are controllable and at the middle speed setting barely audible.. Easy to put in Hard drives, Note, I had emailed their tech support and Daniel responded very quickly before and after I purchased the unit. Read and write speeds consistent with other raid devices I use. Using with HTPC for movies music and photos. Using USB 3.0 Plays movies via PC, no sweat.

Cons: Unit works well, metal and plastic although not a functional problem metal is a bit thin for my taste, otherwise, and so far, a very satisfying experience

Other Thoughts: Tech support, was excellent, I like the fact they responded so quickly to my two or three emails.

Did you find this review helpful? Yes No

  • Rigoberto C.
  • 1/26/2015 2:08:09 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month

4 out of 5 eggsWorks well for its intended purproses

Pros: 8 Bays
USB 3.0
Raid 50

Cons: can't do non-raid functions
Raid 5 - can't use all 8 drives in one array.(7 drives and 1 parity). Can only do 3 drives and 1 parity, times 2.

Other Thoughts: I've have both the raid and non-raid version of this enclosure. This one works well if you know the limitations. First one is it doesn't do any non-functions. If you want the option to use individual drives this is not the box you want. It doesn't have the flexibility different type of arrays at the same time. I did like the raid 50 option, which is essentially two raid 5 arrays stripped. I actually ended up liking this option. If you use 8 drives you only get the capacity of 6 of them. Also it states up to 4 drives can fail and not loose data.

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  • gerald c.
  • 9/3/2014 2:30:16 PM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day

1 out of 5 eggsRAID 5 problems

Pros: Futher to ppl mentioning that this enclosure "splits" the 8 drives into 2x4 drives for a RAID 5 config, I just spoke to tech support @ Mediasonic and confirmed that this is not so, and that using all 8 bays will give the user 7 bays of data with one bay for parity [as I already knew], so I'm sure that ppl here are using RAID 5-0 and NOT RAID 5.

Cons: n/a

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  • Brian V.
  • 8/12/2014 11:33:36 AM
  • Tech Level: High
  • Ownership: less than 1 day

2 out of 5 eggsWarning: Does not actually support 8 Drive RAID-5

Pros: We use the 4-disk Proraid units. And they are great. This one might work well too with the given limitations, but had to return it because it didn't do what we wanted.

Cons: We purchased this hoping to build a RAID-5 out of 8 disks. But the maximum number of disks you can assign to a RAID-5 is 4 with this unit. Although you can have two such arrays (2x4=8 disks total), this sacrifices two disks to parity, one disk in each array. That is a waste of space (better redundancy though). For our purposes we might as well use the 4-bay units, which can be independently-managed.

Other Thoughts: We never powered it on because we discovered from the instructions that it didn't do what we expected. We returned it.

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

  • Sam S.
  • 12/19/2013 3:41:03 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

2 out of 5 eggsNot for sale

Pros: ease to insert Hard Drives

Cons: No real Manuals.
Randomly disconnect from computer. Randomly crashes OS. Almost NO SUPPORT.
Main recommendation from Support team - "REPLACE USB cable!"

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

  • Sam S.
  • 12/16/2013 12:21:30 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

3 out of 5 eggsnot bad idea

Pros: good IDEA

Cons: very pour realization. very bad instruction.
periodically disconnect from computer

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

  • Kevin M.
  • 7/4/2013 2:08:29 PM
  • Tech Level: High
  • Ownership: more than 1 year

5 out of 5 eggsWorks with 4TB

Pros: It was believed to only support up to 3TB hard drives but 4TB works flawlessly. I've been running one in it for over a month now with no problems, and the other 3TB drives are still fine after over a year of use.

Cons: The USB 3.0 cable that comes with it is way too short.

Other Thoughts: I love this enclosure. It's one of the best PC hardware investments I've ever made. I wonder if it will support the upcoming 5.5TB drives. I can't wait to find out...

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

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