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Mediasonic Slimbox 2.5in SATA HDD External Hard Drive Enclosure USB3.0 Black

Mediasonic Slimbox 2.5in SATA HDD External Hard Drive Enclosure USB3.0 Black - 1
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Mediasonic Slimbox 2.5in SATA HDD External Hard Drive Enclosure USB3.0 Black - 70986_l.jpg Customer Photos (0)
Reg. Price: $19.99  CAD
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SKU: 70986
Shipping Weight: 0.2lbs

Part #: H21-SU3

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Product Videos [ Edit ]

Features [ Edit | History ]


Mediasonic ProBox SuperSpeed External Hard Drive Enclosure can instantly convert your 2.5" SATA hard disk drive to an external drive and provides a portable plug-and-play solution for both PC and Mac. The transfer rate is up to 5.0 Gbps via USB 3.0. The external drive provides the portable storage space for your music, photo, video, and data file

Quick Specs:
Package Contents
  • ProBox SuperSpeed 2.5" SATA HDD External Enclosure - USB 3.0
  • USB 3.0 Cable (1M)
  • Screws for Hard Drive
Host Interface USB 3.0

Apple Macbook Notebook

Limited Warranty 1 Year
Weight (Approximate) 1.76 oz
Color Black
Form Factor External
Country of Origin Taiwan
Height 0.7"
Width 3.1"
Depth 5.2"
Number of Total Expansion Bays 1
Number of 3.5" Bays No
Number of 5.25" Bays No
Number of 2.5" Bays 1
Number of 2.5"/3.5" Bays No
Cooling Fan No
Drive Interface Serial ATA
Number of 1.8" Bays No

Specifications [ Edit | History ]

General Information  
     Brand Name: Mediasonic
     Manufacturer: Mediasonic Enterprises
     Manufacturer Part Number: H21-SU3
     Manufacturer Website Address:
     Product Line: ProBox
     Product Name: ProBox SuperSpeed 2.5" SATA HDD External Enclosure - USB 3.0
     Product Type: Drive Enclosure
I/O Expansions  
     Number of 1.8" Bays: No
     Number of 2.5" Bays: 1
     Number of 2.5"/3.5" Bays: No
     Number of 3.5" Bays: No
     Number of 5.25" Bays: No
     Number of Total Expansion Bays: 1
     Drive Interface: Serial ATA
     Host Interface: USB 3.0

Apple Macbook Notebook

     Country of Origin: Taiwan
     Package Contents:
  • ProBox SuperSpeed 2.5" SATA HDD External Enclosure - USB 3.0
  • USB 3.0 Cable (1M)
  • Screws for Hard Drive

     Platform Supported: Mac
Physical Characteristics  
     Color: Black
     Cooling Fan: No
     Depth: 5.2" (131.8 mm)
     Form Factor: External
     Height: 0.7" (18.4 mm)
     Weight (Approximate): 50 g
     Width: 3.1" (80 mm)
     Limited Warranty: 1 Year

Customer Reviews of Mediasonic H21-SU3

Product reviews on are screened for relevance and inappropriate content. Reviews may contain inaccurate information about the product. If there is a discrepancy, please use the Flag this Review link located beside each review. Reviews are not an endorsement expressed by, but opinions from customers based on their own experience with a product. We do not recommend you make purchasing decisions based on facts or opinions expressed regarding Mediasonic H21-SU3 reviews.
Experience: 3 Weeks

Verified OwnerVerified Owner


Affordable. Good speed. Good looking
Cons USB connector seems flimsy


This is the second Mediasonic enclosure I buy lately. First one had a lot of problems during large transfers. Turns out that my internal cable was defective. That convince me to buy another one. Both of them work great.

Experience: 1 Weeks

Verified OwnerVerified Owner


Cheap, USB3
Cons Cheap


Just needed a cheap external USB3 enclosure for an SSD, so I bought this. It does what I needed it to do, and gives decent transfer speeds over USB3. Single USB cable with no separate power cable.

Night Hawk
Experience: 1 Days


USB 3.0
Support SATA3
Portable, 1 cable support data and power
Good price
Cons USB socket is flicky


Came across this enclosure while I was buying some batteries. Seems good deal for a SATA3 enclosure.

I bought some other enclosures before. Not all of them support SATA3. This one works, well, after I resolve some trouble.

First, the enclosure is so tight. It is not really a bad thing. I won't want my HD get loose inside. But a new case, I don't know is it just tight, or it does not fit. After a few plug and remove, it is a lot better now.

The contact of the USB socket is bad. At first I thought my HD does not work. But it is actually the USB socket. After a few try, the light does turn red and flash, it does work. Not sure did I bought a lemon or bad quality. If USB works well, I would give this enclosure 4 or 5 stars.

R. B. Inc.
Experience: 5 Days

Verified OwnerVerified Owner


- Cheap
- Very portable, fits inside a pocket
Cons - Cheap design
- Uses foam tape


Bought for a 500gb Toshiba drive. Transfers are slow, maybe because of the drive or because of the enclosure or because of USB2.0, but regardless for the price I can't complain. Not entirely sure what the maximum capacity is, couldn't find the information anywhere. Did not appreciate the foam tape for noise reduction/impact absorption, they could have easily added padding to the screws.

Barry P
Experience: 3 Days


Cheap, USB 3, easy to install drive
Cons Short USB 3 cable


Worked fine with my OCZ SSD drive. No problems using as a backup. Wouldn't try to swap drives in & out, you need a higher quality enclosure. Good value for the money ($14.99)

Experience: 4 Months

Verified OwnerVerified Owner


Cheap Ext. 2.5 Case
Cons Connections problems on usb3 port.
Small cable...


I bought this case to make a backup disk with an old seagate 360gb lying around. I barely use this drive, so i didn't notice in the first weeks that it often loose connection on usb3 ports. Work as intended on usb2 ports. Maybe a defect device or a poorly designed controller? Who knows... Not the only one with this issue, so check yours in the first day !

Experience: 2 Weeks

Verified OwnerVerified Owner


USB 3.0,Cheap
Cons None


I picked this USB 3.0 enclosure onsale for $14.99 right before christmas. I was looking into getting a WD passport 1 TB, but I didnt like the 1 year warranty it came with, I have had these types of drives fail a couple months after the warranty was up. So I purchased this enclosure along with a 1TB 2.5" western digital blue harddrive just for the peace of mind and because of the 2 year warranty on the 1TB drive just incase of failure. I highly recommend doing it this way instead of buying the prebuild HD enclosures that already come with the drives installed

Experience: 1 Weeks

Verified OwnerVerified Owner


USB 3.0
Cons Plasticky


I bought for the use of cloning my laptop's HDD, and it works perfectly as expected. As with all the other reviews, it is indeed plasticky and cheap-feeling, but it gets the job done.

Experience: 3 Days

Verified OwnerVerified Owner


Cheap price?
Cons Cheap piece of garbage.


Even if it sucks as an enclosure (which is does: it's poorly designed plastic and pads that "hold" your drive in... if you can get it in without trimming back some plastic first), I would give it 3 stars because I needed a cheap alternative to the $30-$50 USB 3.0 to SATA adapters for doing laptop data transfers. Well, it didn't work with the Agility 3 60GB SSD I tried, and it only barely worked with an old 160GB HDD I had laying around. By "barely" I mean that, like everyone else, it had connection issues. I had to unplug and re-plug back in to establish a working connection. Even then, it wouldn't connect at USB 3.0 rate.

Not even worth the hassle if free. Do not buy.

Experience: 30 Days

Verified OwnerVerified Owner


USB 3.0
Easy to install
Cons Cheap material
Cable easily disconnects


Good because its USB 3.0 and cheap. Don't expect much but it gets the job done.

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Messages about Mediasonic Slimbox 2.5in SATA HDD External Hard Drive Enclosure USB3.0 Black

supported max capacity? (Steve_R- May 21, 13, 1 Replies) Read this message

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