***Please Note: It is required that the Unit be connected to a Port Multiplier compatible eSATA Host Controller for the System to see all drives. It is assumed that the driver for the eSATA Host Cotroller is correctly installed.***

Storage Tower II (black color) integrated with AD4SR5HPMU-E, Black color cover and front bezel - Connects up to 4 drives to system via an eSATA port of any SATA controller or USB 2.0 port, Includes 5 Internal SATA data cables (AASAIDC8I), power cord, 2 4P-15 pins SATA power connectors (AA4PSAPC), power cord and user guide.

The Storage Tower II features two standard 5 1/4" drive bays and an integrated power supply in a compact chassis with a stylish and functional front bezel. Similar to other Storage Towers in this family, the back panel on the ST II can accommodate a a varieties of Port Multipliers (PM) and connectors to meet a wide range of applications.

When configured with eSATA/USB Hardware Port Multiplier, the Storage Tower II with a pair of hard drives inside can instantly be turned into a RAID set for redundancy backup or high performance application. Click here for a Port Multiplier Tutorial. The entire RAID set can also be connected to any computer that has an eSATA port or USB 2.0 port. By integrating with two optional Addonics 2.5" Disk Array 4SA, as many as eight 2.5" SATA hard drives can be installed into the Storage Tower II. The back panel also can be configured with multiple eSATA connectors, a regular Hardware PM or the SATA Multilane connector to create a high performance external storage system or a terabyte storage farm that can be connected up to 6 feet away from a computer system.

For the security conscious, Jupiter Cipher Mobile Rack or Saturn Cipher Mobile Rack can be added to provide bullet proof hardware security to protect the data. The Storage Tower II includes a high CFM cooling fan and vented front panel for a well ventilated interior with superior air flow. The case cover which extends over the top and side panels can also be easily removed to provide easy access for storage device installation and cable connection.


    • Great for variety of storage applications - external RAID storage, Video storage, Server storage
    • 2 standard 5 1/4" drive bays
    • Available in ivory cover with silver front panel or black cover with black front panel
    • Back panels with the following connection choices or a combination:
      • 5x1 eSATA Hardware Port Multiplier-XA Enclosure Version (AD5HPMRXA-E) to connect up to 4 SATA/SATA II hard drives  to computer via any eSATA port. Can be configured as RAID 1, 0, 10, 5, 3, BIG, or Clone mode. (RAID setting is configured through onboard jumpers or included Windows software)
      • eSATA 4x1 Hardware Port Multiplier (AD4SR5HPMU-E) to connect up to 4 SATA/SATA II hard drives  to computer via any eSATA or USB port. Can be configured as RAID 1, 0, 10, 5, 5+S, BIG2 or BIG4 (RAID setting is configured through a rotary dial switch, no software is needed)
      • eSATA/USB 5x1 Hardware Port Multiplier (AD5SAHPM-EA) with built-in eSATA and USB 2.0 to connect up to 2 SATA/SATA II hard drives  to computer via any eSATA port or USB 2.0 port. Can be configured as BIG(Concatenated), FAST(RAID 0), SAFE(RAID 1), SAFE33, SAFE50, or JBOD (individual drives).
      • eSATA Port Multiplier (AD5SARPM-E) to connect up to 5 SATA/SATA II hard drives  to computer as via 1 eSATA port (require a PM compatible SATA controller). Can be configured as RAID 1, 0, 1+0, RAID 5, JBOD or as individual drive.
      • Multilane bridge (AD4SAML) )for the latest SATA Multilane connection to connect up to 4 SATA/SATA II hard drives to system via 1 Infiniband Multilane cable
      • 4 eSATA connectors for connecting up to 4 hard drives to system via 4 individual eSATA cables.
      • 2 USIB connectors for connecting choice of USB 2.0/1.1, Firewire/iLink, SATA, or eSATA USIB interface cables.
    • Light weight and sturdy metal frame construction
    • Compact size
    • Ventilated front panel for efficient air flow.
    • Low noise high CFM ball bearing cooling fan
    • 80w 110/240 auto-sense AC/DC adapter
    • LED indicators for each storage device
    • Individual storage devices can be hot swapped* when installed with removable drive systems. Click here for a list of devices which can be installed inside the Storage Tower II.

* For eSATA connection, hot swap feature depends on the controller. All Addonics SATA controllers support the hot swap feature. The Storage Tower II can be powered down and restarted to swap out hard drive without rebooting the system.

 Independent drive configuration is only supported with controllers with Silicon Image SIL3124 or SIL3132 chip set.

 IDE and SATA hard drive can be mixed in the Storage Tower II. IDE hard drives can be changed to SATA interface with the addition of IDE - SATA converter. SATA hard drives can be changed to IDE interface with the addition of SATA - IDE converter.


For power and drive access (Drive Activity LED for model with Port Multiplier Series and JBOD USB back panels only)
Drive Bays 2 standard 5 1/4" drive bays
Connectors on back panel

STII4SR5HM,STII4SR5HM-B- 1 eSATA connector, 1 USB 2.0 type B connector
, STII2XHPMEU-B - 1 eSATA connector, 1 USB 2.0 type B connector
STII5X1PM, STII5X1PM-B - 1 eSATA connector
STII4ML, STII4ML-B - 1 MultiLane 4X connector
STII4ESA, STII4ESA-B - 4 eSATA connectors
STII, STII-B - no back panel

Supported interfaces
(varies depending on the model and some interface may requires additional optional connectors)

eSATA connector - SATA interface
Multilane connector - SATA interface
USB 2.0 type B connector - USB interface
USIB connector - USB 2.0, Firewire or eSATA interface using one of the optional Addonics USIB interface cables.

Supported Operating Systems

Storage Tower II is OS Independent. Supported Operating Systems depends on type of interface or back panel used.

USB 2.0/1.1
- Windows 98SE, Me, 2000, XP, 2003, Linux kernel 2.4 and higher, Solaris 9.0 and higher

SATA/eSATA - DOS, Windows NT/SP6, 98SE, Me, 2000, XP, 2003, Linux kernel 2.4 and higher, Mac OS

Multilane - Windows 98SE, Me, NT 4.0, 2000, XP, 2003 and Linux, Mac OS 10.4.x with G4 or G5

LED lights: STII2XHPMEU, STII2XHPMEU-B - Power, Alarm, USB, SATA, 2 device LEDs
All other models - Power and 5 device LEDs

Power Supply:

80w 110/240 auto-sense AC/DC adapter
Cooling fan 1x 80x80mm fan


6.29 lb (2.86 kg) (100.7 oz)


7.48 x 10.63 x 6.5 inch (190 x 270 x 16.5 mm) (W x D x H)

Operating Humidity:

20% - 80%

Operating Temperature:

5C - 35C

Warranty: One Year

System Requirements

  • PC/AT or Compatible System
  • One of the following IO ports: USB 2.0/1.1, Multilane, eSATA or SATA port.
  • Pentium II 350 MHz or Greater
  • Minimum 64 MB RAM

No additional files, specification sheets, guides or documentation found for product.

Warranty: 1 Year Return to Base

Full manufacturers warranty details are available at the manufacturers (Addonics) web site.

Unless otherwise specified Techbuy is normally your first point of contact for warranty related returns, further information regarding our warranty policies and consumer guarantees is available on our policies and service & support pages.

To apply for return of a product just go to our returns page.

These terms are in addition to and do not affect any terms, conditions, guarantees and warranties implied by law.

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