CalDigit. Serious Storage.

The T4 is a 4-bay storage solution that offers extreme performance and a new level of flexibility not available from traditional RAID 5 solutions. With performance up to 1370MB/s and dual Thunderbolt 2 ports, the T4 is the ideal device to integrate into modern 4K workflows. RAID 5 gives professional users outstanding performance whilst at the same time giving them the reassurance of single drive redundancy. Also, supporting RAID 0 and RAID 1, the T4 is a versatile storage device. The flexible 4-bay design allows users to have two RAIDs in one unit. On top of all these great features, the T4 features an industry leading 5 year warranty that is also backed up by CalDigit’s world renowned technical support.

The biggest benefit of Thunderbolt™ 2 is the ability to integrate modern 4K video workflows through a single cable. Thunderbolt™ 2 offers the ability to connect multiple 4K devices such as monitors, I/O devices, and high performance RAID solutions. With a maximum bandwidth pipeline of 1375MB/s, Thunderbolt™ 2 makes it possible to work with massive 4K files with ease.

Unlike most RAID solutions that use full size 3.5” hard drives, the T4 is also compatible with 2.5” solid state drives. The convenient removable drive design allows users to retrofit their systems in a blink of an eye. Users are no longer limited to choosing between capacity and performance.

The T4 offers an incredible value from a performance to cost ratio.
CalDigit T4 G-Speed Studio Pegasus R4
Drive Bays 4 4 4
SSD Compatible Yes No No
RAID 5 Support Yes Yes Yes
Hybrid RAID (RAID + JBOD) Yes No No
Drive Locks Yes Yes Yes
Chassis Material Aluminum Plastic Plastic & Sheet Metal
5.8 " x 5.3" x 9.5"

8.36 " x 7.94" x 10.08"

7.5 " x 9.6" x 7.3"
Warranty 5 Year
(3 Years Warranty on Drives)
3 Year 2 Year
Maximum Performance HDD: 750MB/s  
SSD : 1370MB/s
HDD: 700MB/s
SSD : N/A       
Price (MSRP) 4TB: $899.00
  8TB: $1199.00
12TB: $1399.00
16TB: $1699.00
20TB: $1999.00
12TB: $2199.95
16TB: $2699.95
24TB: $3599.95
8TB: $1499.00

Promise R4 data correct as of 7/17/14
from: htttp://
Promise R4 price correct as of 7/17/14
G-Speed Studio data obtained 7/8/14 from:

Professionals require equipment built to withstand the rigors of their work environment. The T4 is constructed with a die-cast aluminum chassis that offers a level of durability that is unmatched by other inferior materials such as polycarbonate.

Every professional external RAID storage solution needs powerful software to manage that RAID device. The CalDigit Drive Utility completely runs and configures the CalDigit T4. This powerful software provides vital drive information, RAID management, event notifications, email notifications, event logs, and disk benchmark tests. The CalDigit Drive Utility can also be used to monitor multiple T4 units and CalDigit’s other Thunderbolt™ RAID storage solutions.

The T4 can achieve a new level of extreme performance that is ideal for use with today’s leading content creation software. A user can choose between high performance SSDs or 3.5” HDDs that offer higher capacities.
*Actual data rates may vary depending on operating environment and other factors, such as RAID mode, RAID configuration, and disk capacity.

The T4 can support a variety of RAID configurations such as RAID 0, 1, and 5. This allows the user to configure their T4 according to their needs.
RAID 5 (Parity Striped)
Users that require a combination of performance and protection will opt for RAID 5. RAID 5 offers single drive redundancy along with the performance of a striped set. In the unlikely event of a single drive failure, the data will remain intact and accessible.
RAID 0 (Striped)
RAID 0 is ideal for users that require maximum performance from their RAID array. A backup is highly recommend since RAID 0 does not offer any protection.
RAID 1 (Mirrored)
RAID 1 is ideal for those who require a backup solution. Any data written to the RAID will be copied onto each of the four drives, resulting in four copies of the data.

Mode Minimal Disks Protection Performance
RAID 5 4 ★★★ ★★★
RAID 0 2 ★★★★
RAID 1 2 ★★★★

The T4 allows users the flexibility of combining the unit into a RAID (0 or 1) with a JBOD. As well as this, users can RAID two drive bays into a RAID (0 or 1), and RAID the other two drive bays in the same way. This gives users two RAIDs in one. This versatility opens up many possibilities for the user to tailor their storage to their needs, instead of the other way around.

The four bay design offers stunning performance in a compact package. The beautiful design takes up less desk space than typical RAID storage solutions.

The CalDigit T4 features the latest Thunderbolt™ 2 technology for use with the latest Mac and PC Thunderbolt™ 2 equipped computers, and is also backwards compatible with computers equipped with the original Thunderbolt™ interface. Thunderbolt™ 2 takes the original Thunderbolt™ ‘s dual 10GB/s bi-directional channels and combines them into a single 20Gb/s bi-directional channel.
Interface 2x Thunderbolt™ 2 ports
Interface transfer rates up to 20GB/s
- Up to 20TB
- Up to 4TB
• Height
• Width
• Depth
: 5.8 inches (148 mm)
: 5.3 inches (135 mm)
: 9.5 inches (242 mm)
/ 3.3Kg
/ 5.65Kg
(SSD  x4)
(HDD x4)
RAID Function Supports RAID 0,1,5 and JBOD
Automatic disk failure detection
Hot swappable disks
Fan Specification
Noise Level
: 80 x 80 x 25mm
: 1500 R.P.M.+/-10%
: 21.9 CFM (ft3/min)
: 17.0 dBA
Power Supply Adapter
AC input
DC output
: 100-240v-2.0A, 50-60Hz
: 12V-12.5A
System Requirements Mac OSX 10.8 or later
Windows 7, 8 & 8.1
Computer with Thunderbolt™ Port
In the Box • 1 x CalDigit T4
• 4 x Drive Modules
• 1 x AC Adapter
• 1 x AC Power Cord
• 2 x Keys
• 1 x CD with CalDigit Drive Utility software & Manual