Western Digital My Book Studio Edition II (6TB) comparison

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Product name

WD My Book Thunderbolt Duo (4TB)

WD My Book Thunderbolt Duo (4TB)
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Promise Pegasus R4 (4TB)

Promise Pegasus R4 (4TB)
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Price $999 at 1 store $449 to $799 at 9 stores $599 at 1 store $681 to $1,297 at 3 stores
CNET editors' rating
3.5 stars Very good
    Overall score: 7.2 (3.5 stars)
3.5 stars Very good
    Overall score: 7.2 (3.5 stars)
4.0 stars Excellent
    Overall score: 8.4 (4.0 stars)
3.5 stars Very good
    Overall score: 7.0 (3.5 stars)
3.5 stars Very good
    Overall score: 7.6 (3.5 stars)
Average user rating 4.5 stars out of 1 review 2.0 stars out of 6 reviews 0 stars No reviews, write one! 0.5 stars out of 1 review 0 stars No reviews, write one!
Release date April 12, 2011 April 03, 2008 August 29, 2012 March 21, 2012 August 15, 2011
The Bottom Line The My Book Studio Edition II makes a decent direct-attached storage solution for those who need to extend a computer's storage space or want a large backup drive. The drive's rather buggy firmware might turn many users away, however. The My Book Studio Edition II makes a decent direct-attached storage solution for those who need to extend a computer's storage space or want a large backup drive. The drive's rather buggy firmware might turn many users away, however. The My Book VelociRaptor Duo is one of the best storage devices thanks to its balanced combination of excellent performance, practical design, and relatively friendly pricing. The WD My Book Thunderbolt Duo makes a very good external storage device for Thunderbolt-enabled Macs thanks to its comparative affordability, ease of use, and decent performance. The Pegasus R4 would be a very good investment for those who have a Thunderbolt-enabled computer, be it Windows PC or Mac.

Basic specs

Features See What's the Same or What's different
Packaged Quantity 1
1
1
1
1
Total Array Capacity 6 TB
2 TB
2 TB
4 TB
4 TB
Max Supported Capacity Info unavailable Info unavailable Info unavailable Info unavailable 8 TB
Interface Serial ATA-300
Hi-Speed USB
FireWire 800
FireWire 400
Serial ATA-300
Hi-Speed USB
FireWire 800
FireWire 400
Thunderbolt
Thunderbolt
Thunderbolt
Microsoft Certification Compatible with Windows 7
Compatible with Windows 7
Info unavailable Info unavailable Info unavailable
Weight 5.7 lbs
5.7 lbs
4.2 lbs
4.9 lbs
9.9 lbs
Device Type Hard drive array
Hard drive array
Hard drive array
Hard drive array
Hard drive array
Environmental Standards Info unavailable Info unavailable Yes
Info unavailable Info unavailable
OS Required Apple MacOS X 10.5
Microsoft Windows Vista / 7
Apple MacOS X 10.6
Apple MacOS X 10.4.10 or later
Apple MacOS X 10.5.2 or later
Microsoft Windows Vista / 2000 / XP
Apple MacOS X 10.6.8 or later
Apple MacOS X 10.6.8 or later
Apple MacOS X 10.6 or later
Installed Devices / Modules Qty 2 (installed) / 2 (max)
2 (installed) / 2 (max)
2 (installed) / 2 (max)
2 (installed) / 2 (max)
4 (installed) / 4 (max)
Localization Latin America
Canada
United States
Latin America
Canada
United States
Latin America
Canada
United States
Latin America
United States
Canada
Info unavailable
Supported Drives Info unavailable Info unavailable Info unavailable Info unavailable Serial ATA-600
Manufacturer Warranty 5 years warranty
5 years warranty
3 years warranty
3 years warranty
2 years warranty
Dimensions (WxDxH) 3.9 in x 6.1 in x 6.5 in
3.9 in x 6.1 in x 6.5 in
3.9 in x 6.2 in x 6.5 in
3.9 in x 6.2 in x 6.5 in
7.4 in x 9.3 in x 7.7 in
Optical Storage None
None
Info unavailable Info unavailable Info unavailable
Storage Controller (2nd) None
None
None
None
Info unavailable
Storage Controller RAID - RAID RAID 1
- RAID RAID 0
RAID - RAID RAID 1
- RAID RAID 0
RAID - RAID RAID 1
- RAID JBOD
- RAID RAID 0
RAID - RAID RAID 1
- RAID JBOD
- RAID RAID 0
RAID ( Serial ATA-600 ) - RAID RAID 1E
- RAID RAID 1
- RAID RAID 10
- RAID RAID 6
- RAID RAID 5
- RAID RAID 0
Full specifications Full specifications Full specifications Full specifications Full specifications Full specifications
Buying choices
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