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

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Product name

WD My Book Thunderbolt Duo (6TB)

WD My Book Thunderbolt Duo (6TB)
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WD My Cloud EX4 (16TB)

WD My Cloud EX4 (16TB)
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Promise Pegasus R4 (4TB)

Promise Pegasus R4 (4TB)
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Price $999 at 1 store $599 to $750 at 8 stores $999 to $1,199 at 7 stores $875 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: 7.0 (3.5 stars)
4.0 stars Excellent
    Overall score: 8.4 (4.0 stars)
4.0 stars Excellent
    Overall score: 8.0 (4.0 stars)
3.5 stars Very good
    Overall score: 7.6 (3.5 stars)
Average user rating 4.5 stars out of 1 review 0 stars No reviews, write one! 0 stars No reviews, write one! 0 stars No reviews, write one! 0 stars No reviews, write one!
Release date April 12, 2011 January 10, 2012 August 29, 2012 November 07, 2013 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 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 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. It's not the fastest NAS, nor does it include many advanced features, but the WD My Cloud EX4 still combines great ease of use into an affordable personal cloud system that's excellent for a connected home. 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
Info unavailable 1
Total Array Capacity 6 TB
6 TB
2 TB
Info unavailable 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
Thunderbolt
Thunderbolt
Info unavailable Thunderbolt
Microsoft Certification Compatible with Windows 7
Info unavailable Info unavailable Info unavailable Info unavailable
Weight 5.7 lbs
5.1 lbs
4.2 lbs
Info unavailable 9.9 lbs
Device Type Hard drive array
Hard drive array
Hard drive array
Info unavailable 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 10.6.8 or later
Apple MacOS X 10.6.8 or later
Info unavailable Apple MacOS X 10.6 or later
Installed Devices / Modules Qty 2 (installed) / 2 (max)
2 (installed) / 2 (max)
2 (installed) / 2 (max)
Info unavailable 4 (installed) / 4 (max)
Localization Latin America
Canada
United States
Latin America
United States
Canada
Latin America
Canada
United States
Info unavailable Info unavailable
Supported Drives Info unavailable Info unavailable Info unavailable Info unavailable Serial ATA-600
Manufacturer Warranty 5 years warranty
3 years warranty
3 years warranty
Info unavailable 2 years warranty
Dimensions (WxDxH) 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
Info unavailable 7.4 in x 9.3 in x 7.7 in
Optical Storage None
Info unavailable Info unavailable Info unavailable Info unavailable
Storage Controller (2nd) None
None
None
Info unavailable Info unavailable
Storage Controller 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
Info unavailable 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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