USB 3.0 / eSATA 5-Bay Hot-Swap 2.5/3.5” SATA III Hard Drive Enclosure with UASP – 5-Bay SATA 6 Gbps Enclosure for HDD / SSD

Connect five hot-swappable 2.5/3.5" SATA III hard drives to your computer externally through USB 3.0 with UASP or eSATA

Product ID: S355BU33ERM

3 stars (3 reviews) |
  • Supports SATA III (6 Gbps) and UASP for optimal performance
  • Supports both 2.5" and 3.5" form factor hard drives (HDD) and solid state drives (SSD)
  • eSATA or USB host connection

The S355BU33ERM 5-bay Removable Hard Drive Enclosure lets you access five individual 2.5" or 3.5" hard drives simultaneously, through a single eSATA or USB port connection to your laptop or desktop computer.

For fast performance and efficient data transfers, you can connect the removable drive enclosure to your computer through either eSATA or USB 3.0. The enclosure supports full SATA III data transfer rates up to 6 Gbps, when connected through eSATA. When connected through USB 3.0, the enclosure supports  transfer speeds up 5 Gbps plus support for UASP, which performs up to 70% faster than conventional USB 3.0 when paired with a UASP-enabled host controller.

With support for the fastest drive technologies available including SATA III (6 Gbps), hybrid drives and solid state drives (SSD), the enclosure helps you save time through optimized performance from your external storage.

For optimal drive performance and longevity, the HDD/SSD enclosure features a built-in fan, which helps cool your drives while ensuring maximum heat dissipation. 

To ensure compatibility with your computer system, the S355BU33ERM supports all of the leading operating systems, including: Microsoft Windows® (8/7/Vista/XP/Server 2008/Server 2003), Apple® OSX (10.9/10.8/10.7/10.6), Linux, and Google Chrome OS™.

The S355BU33ERM is backed by a StarTech.com 2-year warranty and free lifetime technical support.

Improved Performance with UASP

UASP is supported in Windows 8, Mac OSX (10.8 or above), and Linux. In testing, UASP performs with a 70% faster read speed and 40% faster write speed over traditional USB 3.0 at peak performance.

UASP Speed Diagram

At the same peak in testing UASP also shows an 80% reduction in required processor resources.

UASP Speed Diagram

Testing results were obtained using an Intel® Ivy Bridge system, a UASP-enabled StarTech.com Enclosure, and a SATA III solid state drive.


  • Add a 5-bay hot-swap enclosure to a server or workstation computer, for a removable backup solution
  • Expand the storage capabilities of a small form factor/embedded system or laptop, with external drives
  • Adding external storage capacity for video editing or photo editing stations, making it easier to work with very large file sizes
  • Creating additional backup/archive storage
  • Turn unused SATA hard drives into additional external data storage

The StarTech.com Advantage

  • Versatile connectivity options, through either USB or eSATA
  • Maximize performance, with SATA III file transfer speeds up to 6Gbps using eSATA
  • Save time, with file transfers up to 70% faster than traditional USB 3.0 when used with a UASP-supported host

Partner Numbers

  • Ingram Micro Netherlands 2784141
  • UPC 065030859295


  • OS Independent logo
OS independent; No software or drivers required


Warranty Information Warranty 2 Years
Connector(s) 5 - Drive Connectors SATA Data & Power Combo (7+15 pin)
1 - Host Connectors USB Type-B (9 pin) USB 3.0
eSATA (7 pin, Data)
Environmental Operating Temperature 5°C to 55°C (41°F to 131°F)
Storage Temperature -40°C to 70°C (-40°F to 158°F)
Humidity 10% ~ 90% non-condensing
Hardware Interface USB 3.0 & eSATA
Bus Type USB 3.0
Number of Drives 5
Drive Size 2.5in & 3.5in
Compatible Drive Types SATA
Drive Installation Removable
Number of 2.5 inch bays 5
Number of internal 3.5 inch bays 5
Fan(s) Yes
1 - Fans 120 mm
Fan Bearing Type Sleeve Bearing
Chipset ID JMicron - JMB575M
JMicron - JMS567
Indicators 5 - LED Indicators Drive Activity / Interface LED
1 - LED Indicators Power LED
Packaging Information Package Height 21.2 cm [8.3 in]
Package Length 34.6 cm [13.6 in]
Shipping (Package) Weight 5.3 kg [11.6 lb]
Package Width 32.3 cm [12.7 in]
Performance Air Flow Rate 35CFM
Noise Level 20.4 dBA
Maximum Data Transfer Rate 6 Gbps
Type and Rate USB 3.0 - 5 Gbit/s
UASP Support Yes
Type and Rate eSATA (6 Gbps)
Port Multiplier Yes
Hardware Raid Supported No
Max Drive Capacity Currently tested with up to 6TB 7200 RPM hard drives
Hot Swap Capability Yes
General Specifications Supports 2.5in Solid State Drives (SSD) and Hard Drives (HDD) using a 2.5in to 3.5in drive adapter such as 25SAT35HDD and 25SATSAS35
Physical Characteristics Color Black
Product Length 28.1 cm [11.1 in]
Product Width 15.1 cm [5.9 in]
Product Height 21.5 cm [8.5 in]
Weight of Product 4.0 kg [8.8 lb]
Software OS Compatibility OS independent; No software or drivers required
What's in the Box 1 - Included in Package USB 3.0 / eSATA SSD/HDD Enclosure
SATA to eSATA full profile bracket
eSATA cable
USB 3.0 cable
2.5/3.5” drive installation screw kit
Instruction manual
5 - Included in Package 2.5/3.5” drive trays (preinstalled)
3 - Included in Package Power cables (NA/UK/EU)



5 ft Black Desktop SuperSpeed USB 3.0 Extension Cable - A to A M/F

Extend a USB 3.0 port from the back of your computer to your desktop

Your price
€16,99 EUR excl. BTW
€20,56 EUR incl. BTW

1m Black SuperSpeed USB 3.0 Cable - Right Angle A to B - M/M

Connect USB 3.0 devices, even in hard to reach areas and tight spaces

Your price
€10,99 EUR excl. BTW
€13,30 EUR incl. BTW

2m Black SuperSpeed USB 3.0 Cable - Right Angle A to B - M/M

Connect USB 3.0 devices, even in hard to reach areas and tight spaces

Your price
€3,99 EUR excl. BTW
€4,83 EUR incl. BTW

3 ft Black SuperSpeed USB 3.0 Cable A to B - M/M

Connect to your external solutions and transfer data at 10x the speed of USB 2.0

Your price
€6,99 EUR excl. BTW
€8,46 EUR incl. BTW

2 Port SATA 6 Gbps ExpressCard eSATA Controller Card

Add Two External SATA 3.0 (6Gbps) Ports to a Laptop, for High Speed Access to Large External Storage Solutions

Your price
€63,99 EUR excl. BTW
€77,43 EUR incl. BTW

2 Port SATA 6 Gbps PCI Express eSATA Controller Card

Add Two eSATA 3.0 (6Gbps) Ports for High Speed Access to Large External Storage Solutions

Your price
€47,99 EUR excl. BTW
€58,07 EUR incl. BTW

2 Port PCI Express SATA 6 Gbps eSATA Controller Card - Dual Port PCIe SATA III Card - 2 Int/2 Ext

Add 2 external or internal SATA 6 Gbps ports to a computer, through a PCI Express slot

Your price
€56,99 EUR excl. BTW
€68,96 EUR incl. BTW

1x eSATA + 1x SATA 6 Gbps PCI Express SATA Controller Card Adapter

Add external and internal 6 Gbps SATA 3.0 ports for high speed storage access

Your price
€42,99 EUR excl. BTW
€52,02 EUR incl. BTW


Talk to an Advisor

We are always ready to assist you with any questions you may have.

Live Chat (opens in new window)




Product Support

Talk to an Advisor

We are always ready to assist you with any questions you may have.

Live Chat (opens in new window)

Frequently Asked Questions


SATA hard drive controllers require a feature called port multiplier to read more than one hard drive per SATA or eSATA port. The port multiplier feature is not standard on many SATA hard drive controllers.

If your computer is only recognizing one of your hard drives, you need to plug the eSATA cable into a SATA controller that includes the port multiplier feature. If none of your current hard drive controllers include this feature, you can add a hard drive controller that does support port multiplier in any available expansion slot (for example, PCI, PCI-Express, PCMCIA, CardBus, or ExpressCard). StarTech.com has hard drive controllers available that support the port multiplier feature. To view the hard drive controllers, click here: http://startech.com/Cards-Adapters/HDD-Controllers/SATA-Cards/?filter_PORTMULTIPLIER=Yes.

If you have a hard drive controller card that does support the port multiplier feature but it is only reading one hard drive at a time, update the drivers of the hard drive controller. To find the most current StarTech.com drivers, click here: http://www.startech.com/Support.

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
  • Hard drives
  • Hard drive enclosure

To test your setup components, try the following:

  • 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.

You should not upgrade your device's firmware if you do not have any issues with the functionality of your device. The only time you should consider an upgrade is if you are experiencing a problem with the device, and you have confirmed that the firmware addresses this problem.  You can confirm this is the case by reviewing the documentation included with the firmware or by consulting with our Technical Support team. Incorrectly upgrading firmware can result in diminished performance so it is best to contact StarTech.com if you would like to perform this operation.

How To

To confirm that the Mac OS detects your USB device, complete the following:

  1. Click the Apple icon.
  2. Click About This Mac.
  3. Click More Info or System Report.
  4. Under the appropriate heading, confirm that your USB device is listed and that there isn't an error. For example, a network card would be under Ethernet Cards.

You may need to refresh the System Information page after you plug in your device.  To do so, press Command R with the System Information page open.

Your USB device is listed according to the name of the chipset. To determine the name of the chipset of your USB device, navigate to www.StarTech.com and look on the Technical Specifications tab for your product.

Before You Buy

To determine if your hard drive will work in this enclosure, on the product page, click the Technical Specifications tab, and do the following:

  • Make sure that the enclosure supports the storage size of your hard drive. If the storage size of your hard drive is larger than what the enclosure was tested with, the hard drive will likely still work with the enclosure.
  • Confirm that your hard drive uses the same interface type as the enclosure. For example, IDE, SATA, or M.2.
  • Make sure that the enclosure supports the physical size of your hard drive, such as 2.5 inches or 3.5 inches.
  • Make sure that the enclosure supports the height of your hard drive. For example, 9 mm or 15 mm.
  • Verify that the power consumption of your hard drive doesn’t exceed the power output of the enclosure. If you’re using multiple hard drives, make sure that the combined power consumption of all of the hard drives doesn’t exceed the power output of the enclosure.

Compliance and safety

Compliance letters

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

Customer Reviews

(3 reviews)
3 out of 5 stars
  • 5 (0)
  • 4 (1)
  • 3 (1)
  • 2 (1)
  • 1 (0)
Tell us what you think of this product.
Need a little help getting started?

Check out our review guidelines.

1 - 3 of 3 Reviews
(4 Stars)

Mighty fast box!

By: hainjedaf - 06/13/2017
Bought this one just last week. It was the only one with JMicron 567 which has a 6Gbit eSATA bus. Performance difference between USB3 and and eSATA is negligeable. In contrast to the earlier model I bought, this one has proper hard drive cooling. It works seamlessley with Linux and Windows. Only issues I had: -Linux recognises drives in different order from numbering on enclosure. So I stuck a label with correct numbering on. -Allthough the trays have light-carriers alongside to cater for individual drive status leds, no leds are mounted in the backplane. So the only indicator are the drive activity leds on the front panel.
| Helpful?
(2 Stars)

Worked, for a while

By: Jasen - 06/05/2019
I received this as a gift in december 2018. Since then the product worked flawlessly for a long period of time, until relatively recently. I started having issues when using it with a mac, and with nearly 2 TB of data across 5 HDD's all my drives became corrupted and wouldnt mount. Not understanding what was happening and being a fixer I tried everything I could think to get this back online, even going as far to hook up a different power supply. The dock will corrupt any mac drive that is connected for me, and in windows I get a read/write speed of 34MB/s both ways (USB 2.0 speed) I havent tried the esata I just prefer options and have only used USB 3.0. This unit has huge issues on a 3.1 port, will not consistently stay mounted, has a garbage read/write, the power cable failed, and Ive tried other USB cables without luck. A firmware update has not changed the behavior. Im not sure how the device went from issue free to borderline useless and a risk to my data in 6 months, but I refuse to even bother with a warranty. Startech makes good products and I trusted them but my unit has really made me feel like I might as well have thrown away $200+. Not looking for compensation, as Ill find a way to fix this myself. Just wish to make other buyers aware this thing may act up, and if it does dont bother troubleshooting just straight up return it. Overall build is solid otherwise. Its a product I was in love with until maybe a month ago.
| Helpful?
Matt, Customer Support on 06/06/2019 13:24:40
Hello Jasen, We're sorry to hear that the data on your drives became corrupted while they were in our S355BU33ERM. If you decide you would like to look into this further with us, please feel free to reach out to us at www.startech.com/support. The S355BU33ERM has a 2-year warranty with lifetime technical support and our Technical Advisors are available 24 hours a day, 5 days a week to provide assistance.
(3 Stars)

Enclosure keeps failing

By: Paul2020 - 04/13/2020
I purchased this 5 bay eSATA / USB hot swap enclosure in October 2019 and now April 2020 the enclosure keep failing. It is not longer recognized by my NAS which I use for backups. I have to cycle the power in order for the NAS to recognize it again. During backups, the enclosure fails. I replaced the hard drives and still the problem exists.
| Helpful?
Matt, Customer Support on 17/04/2020 16:35:54
Hello Paul, We're sorry to hear about the difficulties you're experiencing with our S355BU33ERM. This enclosure should not be failing and it sounds like the unit you have may be faulty. The S355BU33ERM comes with a 2-year warranty and free lifetime technical support and we'd be happy to help look into this with you. You can contact us at www.startech.com/support where our Technical Advisors are available 24 hours a day, 5 days a week.
Back to top