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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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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



General Spec

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

General Spec

6.10" x 13.86" x 9.96"
11.0 lbs.
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.

Quick Info


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year

Customer Reviews of the Mediasonic H8R2-SU3S2

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  • 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.

Did you find this review helpful? Yes No

  • 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

Did you find this review helpful? Yes No

  • 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

  • Joseph P.
  • 5/27/2013 5:49:45 AM
  • Tech Level: Average
  • Ownership: less than 1 day
  • Verified Owner

5 out of 5 eggsGreat pro raid enclosure

Pros: Only had it 3 days and it is performing flawless. Very easy to setup.

Cons: LCD lights on front.

Other Thoughts: Ordered with newegg shipping and was here in two days.

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  • Churk L.
  • 2/27/2013 11:13:56 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsFirmware update is a Must

Pros: 8 Drive Capacity
Many Raid Level
Quiet on low fan setting
Fairly Fast

Cons: Little to no Documentation
Instruction references steps that doesn't exists

Other Thoughts: My last review was pretty negative, where I couldn't find any help or documentation on the website. I finally follow the leads of one of the review and looked into their forum section. Found a firmware update, and updated both controllers. Now I am getting a steady 60 - 70Mb write speed. Disregard the forum thread that says firmware update for raid 50 only. I am using raid 5, and I took a change to see if performance would be better since I was getting topped out at 8Mb write. And sure enough the firmware did fix the major issue.

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

  • Nevon T.
  • 10/23/2012 9:22:19 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsGreat! once you read the instructions.

Pros: Single connection interface, not like the competition where they include a 2-port PCI-e card or make you use 2 connections.

No need for port multiplier to access all 8 disks

Software to monitor the RAID health, visit their forum and gram the JMicron HW RAID Manager.

Auto detect USB/Esata interface

Great if your requirements are in need of 16TB to 24 TB over a single interface.

Everything comes in the box you need, cables, screwdriver, etc

The unit auto sleeps when it detects no connection

Cons: The setup!

Reading the instructions is a must before you even put your first HDD in.

Cannot use RAID5 using all 8 disks, only option is to use RAID 50 which is 2 sets RAID 5 in RAID 0.

Bright blue LED always active for any bay that is currently occupied by a HDD, then flashes purple for read/write access

The keys are exactly the same cut as my H82-SU3S2,this means if you have one of these units your keys will work on any unit, there goes security!

Uses dual 80mm fans instead of a single 120mm (personal preference.

A bit slow to me when using 4x Samsung 750GB HDDs in RAID 0 via USB3 or Esata, although Esata seems to handles a bunch of smaller files faster than USB3 such ad a folder with 1000 JPEGs.

No SSD support but i knew this a long time ago

Other Thoughts: I brought the H82-SU3S2 back in may and wanted this to run in RAID 0 to back up everything and i wanted it to show up as a single HDD.

On initial setup i could not get the thing working for hours, it would just turn on then a few seconds later turn off, then i got a bright idea "lets try reading the manual" lol. In order to use certain modes the HDDs must be loaded in preselected bays or the unit wont work. I had 4 HDDs and could not use RAID 0 when i loaded bays 1-4 to use that mode, i had to use bays 1,2,5, and 6. Now if i wanted to use 2 sets of RAID 0 then i could use bays 1-4.

The unit lost my RAID 0 when i moved it from my Windows 7x64 box to my WHS V1 unit the first time around, received "no active partitions found error" after checking HDD management i fount it was split in 2 partitions, both not active and needed to recreate a single partition again.

Seems a bit slow to me when using 4x Samsung 750GB HDDs in RAID 0. Although all transfers started at 80MB/s using a 4GB video file the speed dropped in a few seconds. Using a PCIe X1 card with VLI chipset and latest drivers for USB 3 it dropped to 40MB/s while transferring data. On Esata using Intel ICH9 AHCI controller it leveled off at 30MB/s, same for the onboard JMicron JMB36X controller and 60MB/s using Silicon Image 3132 PCIe X1 card. All using latest drivers along with the unit using the latest firmware for the RAID 50 fix from Mediasonic forums. I transfered the same file back to my desktop at 120MB/s though. About 45 minutes to transfer 180GB of 1786 files over Esata Sil 3132 chip at 65MB/s, not bad at all.

I still cannot believe that Newegg shipped this thing from CA to NY in the original retail box, the same thing was done when i ordered the H82-SU3S2, this box came in better condition though, just the adhesive seam came loose.

Im still waiting for HDD prices to become sane, i need 8 2TB drives to fill this thing ASAP.

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

  • Blake W.
  • 7/20/2012 11:35:09 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

5 out of 5 eggsHoped for easier...

Pros: Lightweight, Small Form Factor, USB 3.0, eSata, Raid 50, & Plug n Play Setup.

The caseing is Plastic yet looks and feels nice, so expect it to be lightweight. To the users below, you must read the manual and specifications this unit does not support 8 disc raid 5 configurations. You must do a raid 50 configuration to utilize all 8 drives in a single drive. I read this so I respond accordingly. Running 6 (was 8...) western digital red drives, getting on eSata/USB 3.0 80-100mb's writing, and 150-200mb's reading in the raid 50. So raid 50 is a plus.

Very touchy on the S.M.A.R.T errors, if your drive reports ANY, the enclosure marks the drive as bad. I count that as a plus that way your data can be safe. May work both ways thoe... then again if you want to replace a bad drive your just asking for data failure :)

Cons: No Interface to Manage the Unit, no 100% way to read S.M.A.R.T data.

USB 2.0 speeds were only 20-30mb's a second. Not sure how normal this is.

Other Thoughts: If you expierence Disconnects/Reconnects of the drive, VERIFY all drives are 100% S.M.A.R.T Pass, no warning parameters. If you are using Etron USB 3.0 chipsets, give up; its a terrible Chipset, thats my lot. Get NEC for USB 3.0 Chipset.

You CAN read the S.M.A.R.T data of these drives, IF YOU USE raid 5 (not raid 50) with USB (not eSata), you must use a program called HD Sentinal, hope this helps someone wanting to see this data on there drive. Otherwise the data is unavailable with any other configration I tried.

I still rate it a 5/5 becuase the unit essentially hasn't caused me any issues and is exactly as expected.

PS. If you need support, their forums are great and they do have phone support, its on the non canada website for MediaSonic.

7 out of 8 people found this review helpful. Did you? Yes No

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