Pocket READ ONLY UDD25, USB 3.0 / 2.0

This Pocket READ ONLY UDD25 is a high performance READ only device that blocks any WRITE commands. Comes with a media slot to accommodate most standard 2.5" HDD or SSD, this device can also read 1.8" HDD/SSD and other flash media such as M2 card, mSATA SSD, CFast, CF or slim SATA SSD by using various Addonics optional 2.5" flash adapters. It is a great tool for sharing drives or flash media containing important data among different users or for forensic application. This READER essentially treats any hard drive or SSD as a READ only media, similar to the CD or DVD disc. The Pocket READ ONLY UDD25 is equipped with USB 3.0 interface for easy connection to many Notebook, Desktop, Sever or computing equipment.

The storage media can be inserted or removed from the READER like a floppy disc without restarting the system. practically any storage media that is the same size as the 2.5" hard drive and with the same SATA connector can be accessed by this Pocket READ ONLY UDD25.  Designed to be fully portable, the Pocket READ ONLY UDD25 is powered directly from a computer via the ubiquitous USB 3.0 / 2.0 port. 

For the same READER with full READ/WRITE function, please visit the Pocket UDD25 product page.


 Front view  

 Rear view




The following Addonics optional 2.5" flash drive kit can READ to M2, mSATA, CFast or CF cards via this Pocket READ ONLY UDD25 device:

Show with media side facing up

M2 card in 2.5" M2 drive
kit (AD25M2SSD-E)

mSATA SSD in 2.5" mSATA
drive kit (AD25MSD-E)

CFast card in 2.5" CFast
drive kit (AD25CFASTD-N)

CF card in 2.5" CF drive kit

Slim SATA SSD 2.5" HDD
adapter (AA25SEMBK)

note: the flash cards shown above are for illustration purpose and are not part of the 2.5" flash drive adapter.

2015-01-27 Pocket UDD25

For those in the market for an external solution with multiple connectivity options, the Addonics UDD25 is certainly at the top of its class. Along with having options for both USB 3.0 and eSATA, this solution is bus powered making it extremely portable...

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  • READ only device
  • Protect drive against virus contamination or data tempering
  • WRITE disabled at hardware level. No software hacking to circumvent the WRITE PROTECT function
  • No volatile memory
  • Drive appears to OS as READ only device. Options to format, delete and other commands that alter the content, partition table or MBR of the drive are all disabled by the OS (see screen shots from Windows OS below)
  • READ standard 2.5" SATA HDD/SSD or storage media with same dimension and connectors of the standard 2.5" SATA HDD 
  • Read M2, mSATA, CFast and CF card using optional Addonics 2.5" flash drive kit (these adapters are included in the PRO model: PU25U3WP-4F)
  • Read 1.8" HDD/SSD with optional 1.8"- 2.5" SATA adapter (AD18M25S) or slim SATA SSD with optional slim SATA - SATA adapter (AA25SEMBK)
  • Media can be inserted or removed like using a floppy disc without restarting the computer 
  • Supported drive height from 7 - 9.5 mm
  • Connect to system via USB 3.0 / 2.0 port
  • Support USB 3.0 and 2.0 speed*, up to 5 Gbps data transfer* with USB 3.0 connection
  • Comes with all necessary cables: USB 3.0 male A - male A cable (AAU3AA3F)
  • Portable - compact size and weight less than 6 oz
  • Powered from USB port or optional external power adapter (AAPAC5V)
  • Complete Plug and Play, no software driver to install
  • Media can be used as a boot device (for CF card, it may need to be fixed disk type depending on the OS)
  • Compatible with all Windows OS (XP or newer release), Mac OS X and later release, Linux kernel 2.4 and later


*Note: Maximum data transfer rate depends on the speed of the storage media


Sample of Windows 8 screen shots showing options to format, delete and other commands that alter the content or structure of the drive are all disabled by the OS 


  • Drive slot accommodates drive thickness up to 9.5 mm
  • Device interface connectors: USB 3.0 type A female
  • Combo LED for power and drive access
  • Powered from USB port or via external power adapter (AAPAC5V)
  • Dimension (W x L x H): ~ 118 x 137 x 26 mm (4.65 x 5.39 x 1.02 in.)
  • Weight: ~159 g (5.6 oz.)
  • Operating temperature and humidity: 0 - 65° C, 5 - 90 %RH
  • Storage temperature and humidity: -20 - 75 ° C, 0 - 95 %RH (non-condensing)


PU25U3WP - (Pocket READ ONLY UDD25, USB 3.0)
Content: Pocket READ ONLY UDD25 with USB 3.0 connection, 1M USB 3.0 male A - male A cable (AAU3AA3F), user guide.
Price: 45.00
PU25U3WP-4F - (Pocket READ ONLY UDD25 PRO, USB 3.0)
Content: Pocket READ ONLY UDD25 with USB 3.0 connection, 1M USB 3.0 male A - male A cable (AAU3AA3F), 2.5" M2 Flash drive (AD25M2SSD), 2.5" mSATA flash drive (AD25MSD), 2.5" CFast flash drive (AD25CFASTD-N), 2.5" CF flash drive (AD25CFD-N), user guide.
Price: 115.00
PU25U3WP-M - (Micro SATA drive READ ONLY, USB 3.0)
Content: Micro SATA READ ONLY Reader with USB 3.0 connection, 1.8" micro SATA - 2.5" SATA HDD adapter (AD18M25S), 1M USB 3.0 male A - male A cable (AAU3AA3F), user guide
Price: 55.00


AAU3AA3F (USB 3.0 male A- male A cable, 3 feet)
AAU3AA3F    3 feet USB 3.0 male A- male A cable.
Price: 6.99
AD18M25S (1.8" micro SATA - 2.5" SATA HDD adapter)
Content: 1.8" micro SATA - 2.5" SATA HDD adapter,
Price: 19.00
AD25MSD-E (2.5" mSATA flash hard drive kit PRO)
Content: 2.5" mSATA flash memory hard drive kit for standard mSATA and mSATA mini (half size) SSD
Price: 24.95
AD25CFASTD-N (2.5" CFast HDD kit, open end, black )
Content: 2.5" CFast hard drive kit with open end black color bracket for easy media nstallation, user guide.
Price: 24.95
AD25M2SSD-E (2.5" M2 Flash drive kit PRO)
Content: 2.5" M2 (NGFF) SSD drive kit with easy media installation or removal design
Price: 24.95
AD25CFD-N (2.5" CF HDD PRO, easy media insertion and removal, black color)
Content: 2.5" CF hard drive kit with black color bracket and open end for easy media installation.
Price: 26.95
AA25SEMBK (Slim SATA SSD 2.5" HDD adapter)
Content: 2.5" HDD adapter kit for slim SATA embedded SSD, user guiode
Price: 19.00
AAPAC5V (US type 5V/2A AC adapter)
AAPAC5V 110/220V-5V power adapter. For use with all Addonics Pocket Series devices except Pocket UDD and Mini ExDrive USB 2.0
Price: 12.95