The ARCTICROC 4T Tower RAID - 5 Ports


Desktop RAID System - 5 Ports

The Arcticroc is a highly versatile RAID system that is available in a 4-Bay Tower model with up to 16 Terabytes of disk storage.  The drives are Hot-Swappable, with transfer speeds of 3 Gbits/s to and from the host. ARCTICROC is also compatible with both Windows® and Macintosh® Operating Systems.

Streamlines your Data Storage Management!

Speed and massive storage capacity are typically cited as the prime benefits of RAID storage management. Real-time redundant backup of data and fault tolerance make RAID a critical part of any enterprise, regardless of size. Commercial enterprises that fail to employ (or use) RAID or disk mirroring can face large costs in the event of disk failure. Upon careful analysis, potential adopters of RAID technology will discover that the greatest cost of disk failure is the accumulated long term loss of data and subsequently loss of time and money. Designed for professional users and the enterprise sector, the newly released 4-Bay Arcticroc Tower RAID systems helps prevent data loss and streamlines storage management.

Special Features

  • Supports current SATA II RAID compliant hard drives, fully backward compatible with SATA 1.0 and SATA 1.0a compliant hard drives.
  • Connects via USB 2.0, eSATA, IEEE 1394a, and IEEE 1394b ports.
  • Provides JBOD, RAID 0 (Striping), RAID 1 (Mirroring), Span, Clone, RAID 5, RAID 10 (1+0) and optional Hot-Spare for effective storage management.
  • Supports Automatic Rebuild in Raid 1+HotSpare, Clone + Hot-Spare, and RAID 5+HotSpare.
  • Configures RAID modes easily using LCM or RAID MASTER, no IT expertise required.
  • Monitors system status via LED indicators, LCM, or RAID MASTER.
  • Prevents over-tightened hard drives with auto-limiting segmented screws.
  • Features a tray-less function with the Smart-Guider* and user-friendly design enables effortless hard drive hot-swapping.
  • Dissipates heat efficiently with aluminum housing.
  • Maximizes airflow with silent fans and mechanical designs.
  • Supports hot-plug and hard drive hot-swap.
  • Supports both online and offline rebuild.
  • Ensures data integrity with redundant backup capability.
  • Maximizes airflow with silent fans.
  • Smart-Guider* is a tray-less device that utilizes the simplicity of hard drive installation and removal.  The integrated handle is attached to the hard drive with auto-limiting segmented screws.  Then, the entire setup can be slide into the unit by aligning the screws with the specially designed guides.  This enables flexibility in removal and insertion of the hard drives with ease.

ARCTICROC  RAID Systems     
Using this RAID system is as easy and familiar as using a single bay external enclosure. The need for software GUI installation is eliminated. Onboard LED indicators keep you apprised of system, connection, and Hard Disk Drive (HDD) status while the user-friendly HDD tray design makes HDD hot-swapping effortless from the top end.

Two fans blow air through the hard disk drives to dramatically enhance internal air flow and efficiently cool the high speed SATA hard drives within the system.

A Redundant Array of Independent Disks (RAID) is a system that utilizes multiple hard drives to share or replicate data among the disks.  Each selected RAID Mode (combinations of disks), has its own benefits; data integrity, fault-tolerance, throughput or capacity when compared to single drives. 

Identical RAID Compatible hard drives with the same capacity and speeds (Not less than 7,200rpm) (from the same manufacturer is recommended) must be utilized.

RAID 0 (Striping) is a performance-oriented, non-redundant data mapping technique.  It combines multiple hard drives into a single logical unit. Instead of recognizing several different hard drives by the host computer, the operating system recognizes only one large drive.  Striping splits data evenly across two or more disks simultaneously, dramatically increasing performance. 

Although Striping is an easily implemented, simple configuration, Striping should never be used for mission critical applications.  The speed of operation is excellent in comparison to other RAID modes.

Striping mode: if one disk in the RAID System fails, all data in installed disks will be lost.

RAID 1 (Mirroring) consists of at least two drives storing duplicate copies of the same data.  In this mode, the data is simultaneously written to two disks.  Thus, the storage capacity of a two-disk array is combined into a single disk.


In Mirroring mode, if one of the disks fails, either source or backup, the data is still available.  However, if the source disk fails during the rebuild process, the data in both disks will be lost. 

It is NOT recommended to do hot swap for the source disk during the rebuild process because the data in both disks will be lost.
Spanning provides another maximum capacity solution, which some call it as “Large”.  Spanning combines multiple hard drives into a single logical unit.  Unlike Striping, Spanning writes data to the first physical drive until it reaches full capacity. When the first disk reaches full capacity, data is written to the second physical disk.  Spanning provides the maximum possible storage capacity, but does not increase performance.

CLONE consists of at least two drives storing duplicate copies of the same data.  In this mode, the data is simultaneously written to two or more disks.  Thus, the storage capacity of the disk array is limited to the size of the smallest disk.

The difference between Clone and RAID1 in our Smart RAID System is that Clone can perform with more than 2 disks at a time, when Mirror can only perform with 2 disks.

RAID 5 uses block-level striping with parity data distributed across all member disks.  It is also called Parity RAID.  Every time a block is written to a disk in a RAID 5 disk array, a parity block is generated within the same stripe.  A block is composed of many consecutive sectors on a disk.  A series of blocks (a block from each of the disks in an array) is collectively called a "stripe".  The parity information inside the parity block is not the identical copy of the source data.  It is generated via parity calculation.  RAID 5 mode provides decent data protection and fault tolerance.  The speed of operation is average in comparison to other RAID modes. 

The number of disks supported by RAID 5 is 3 or 4.  The storage capacity will become all disks in total but minus 1.  The capacity is limited to the size of the smallest disks.

If one of the disks fails, the data can be reconstructed through parity calculation once the broken disk is replaced with a new one.  

RAID 1+0
In RAID 1+0, the data is first mirrored and then striped.  Under this RAID Mode, it provides another way to achieve higher performance and data security, while increasing complexity.

The key difference between RAID 0+1 and RAID 1+0 is that RAID 1+0 creates a striped set from a series of mirrored drives.  In a failed disk situation, RAID 1+0 performs better because all the remaining disks can continue to be used. The array can sustain multiple drive losses as long as none of the mirror set loses all of its drives. 

RAID 1+0 requires a minimum of 4 drives in an array.  If one of the drives defects, the identical backup data is available offhand.

Just a Bunch of Disks (JBOD) refers to a group of hard drives. In JBOD, the number of logical drives is equal to the number of physical drives.  This mode allows the RAID System to operate as a multi-disk storage enclosure, but provides no data redundancy.

Under the RAID MASTER, JBOD Mode is not listed as an option and the hard drives can be operated as JBOD simply in its original “unreleased” format.  

Hard Drive Hot Swap refers to the ability to add or remove a device from the host computer without powering off the device; the system will automatically recognize the change after the Hot Swapping is completed.

Striping, Span and JBOD modes: it is not recommended to perform Hot Swapping when the hard drive is transferring data.  Any attempt to do so may result in complete loss of all data.

Under RAID 1, Clone, RAID 5, or RAID 1+0, any attempt of Hot Swapping may terminate the data transfer when using the USB2.0 connection.  Please resume the data transfer without Hot Swapping.








Desktop RAID System - 5 Ports

Technical Specifications


Now Available

Apple Store
capacity: 4TB 8TB 12TB 16TB
part number: R345Q2-01 R345U2-01 R345W2-01 R345V2-01
RAID supported: JBOD, RAID 0 (Striping), RAID 1 (Mirroring), Span, Clone, RAID 5, RAID 10 (1+0) and optional Hot-Spare for effective storage management.
Supports Automatic Rebuild in Raid 1+HotSpare, Clone + Hot-Spare, and RAID 5+HotSpare.
Connector USB 2.0, eSATA, FireWire 400 1394a and 2xFireWire 800, 1394b
Data Transfer Speed eSATA: up to 3000 Mbits/s, USB 2.0: up to 480Mbits/s, FW 400
1394a: up to 400Mbits/s  and FW800 1394b: up to 800 Mbits/s
FAN Two quiet fans
Dimension 8.3 (L) x 5.4 (W) x 8.4 (H) Inches or 210 (L) x 138 (W) x 213 (H) mm
Weight Without HDD 5.0 Lbs (2.3 Kgs), with 4xHDD’s 8.4 Lbs (3.8 Kgs)
System Requirements Mac OS 9.X or higher, PowerPC, Mac OS X 10.4
Intel Core Duo Microsoft, Windows 2000, XP, Vista, Windows 7
Warranty: 2 year limited warranty
2 year unlimited toll-free telephone tech support
Contents: RAID System Unit
4 Handles
HDD screws x 16
4 Spare HDD screws
USB cable
FireWire 400 6-6-pin cable
FireWire 800 9-9-pin cable
eSATA cable
External power supply
Quick installation guide
Specifications and appearance are given as guidelines and may change without notice.
Capacity Disclaimer:
Actual accessible hard drive capacity will indicate up to 10% lower than stated under different Operating Systems and formatting. Therefore, a 500GB capacity drive will show up as a 450GB drive (approximately.)
* Benchmarked with Intech Bench Test v3.5. Drive capacity might vary depending on Mac or PC format.


Desktop RAID System - 5 Ports

Product Images

ARCTICROC 4T Desktop RAID System - 5 Ports

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ARCTICROC 4T left view ARCTICROC 4T right view ARCTICROC 4T front view
ARCTICROC 4T front back view ARCTICROC 4T open top view ARCTICROC 4T buttons view


Desktop RAID System - 5 Ports
Data Sheet
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User Manual
EnglishEnglishEnglishUser Manual

ARCTICROC SmartGuider™

Arcticroc SmartguiderCompatible with all Arcticroc desktop systems

ARCTICROC 2T AccessoriesThe new generation RAID system equipped with the SmartGuiderT eliminates the need of a physical tray mechanism and simplifies the HDD installation.
The unique auto-limiting segmented screws prevent HDD damages from over-tightening when the HDDs are installed. The integrated handle enables flexibility in removal and insertion of the HDDs with ease.


Technical Specifications
Supported product line: Compatible with all Arcticroc desktop systems: Arcticroc 2T, 4T, 4Te, and 7T
Part Number: YR300SG-TR
Weight 0.35 Lbs (0.15 Kgs)
Package contains 4 railings and 16 screws