Western Digital has a number of direct-attached storage (DAS) products based on hard drives. They cater to different market segments. These DAS units usually employ a USB port to connect to the host (Thunderbolt is also popular in the high-end market). Within the USB storage bridge market segment, Western Digital has a number of product lines tuned to specific use-cases. For example, the My Passport product line focuses on striking a balance between capacity and portability, while the My Book targets a 'desktop' use-case with external power, but much higher capacity.

Introduction and Product Impressions

The My Book and My Passport product lines were updated last week with a new industrial design. Western Digital has been selling these external storage devices with the highest storage capacity drives in their class for some time now (the 3.5" 8TB version in the My Book, and the 2.5" 4TB version in the My Passport). The refresh last week changes only the chassis and retains the internals from the previous model. Today's review will take a look at the latest versions of the My Book and the My Passport.

The gallery below shows the updated chassis design of the two units and a look at the contents of the two packages. The aspects to note here include the 18W adapter bundled with the My Book, and the longer USB 3.0 cable bundled with it. The My Book unit also comes with a Kensington lock slot.

The new chassis design is definitely more stylish compared to the previous generation. Despite being more pleasing to the eye, certain segments of the chassis act as fingerprint magnets. Also, the new chassis design makes no improvements to the repairability aspect. We would prefer being able to get access to the bare drive in these units easily. This was an issue with the previous design, and it continues that way even with the new units. This is particularly important for the My Book, where a SATA drive is connected to a daughterboard containing the SATA-USB bridge chip (making it possible to use the SATA drive alone after pulling it out of the unit). For the My Passport, we find that the SATA - USB bridge is integrated on to the hard drive's mainboard, and the USB port is the only available interface on the drive itself. A burnt-out bridge chip essentially means it is not possible for the average consumer to retrieve data from the drive in the case of the My Passport.

The table below presents the detailed specifications and miscellaneous aspects of the units and how they compare against other DAS units employing a single hard drive.

Comparative HDD-Based Direct-Attached Storage Device Configurations Aspect Western Digital My Book [2016] Western Digital My Passport [2016] LaCie Porsche Design Mobile Drive G-Tech. G-Drive Thunderbolt [USB3] Seagate Backup Plus G-Tech. G-Drive Thunderbolt [TB] Seagate Innov8 Western Digital My Passport [2016] LaCie Porsche Design Mobile Drive G-Tech. G-Drive Thunderbolt [USB3] Seagate Backup Plus G-Tech. G-Drive Thunderbolt [TB] Seagate Innov8 Western Digital My Book [2016] Bridge Configuration SATA III to USB 3.0 Micro-B SATA III to USB 3.0 Micro-B Power 18W (12V @ 1.5A) External Power Adapter Bus-Powered Internal Drive WD80EZZX-11CSGA0

8TB 5400 RPM 128MB cache 3.5" SATA Hard Drive

HelioSeal, 7-Stac, Hardware Encryption, TLER Off WD40NMZW-11GX6S1

4TB 5400 RPM 2.5" SATA Hard Drive

WD Blue with Integrated USB bridge, Hardware Encryption, TLER Off Physical Dimensions 139.3 mm x 49 mm x 170.6 mm 110 mm x 21.5 mm x 81.5 mm Weight 960 grams 250 grams Cable USB 3.0 Micro-B to USB 3.0 Type-A USB 3.0 Micro-B to USB 3.0 Type-A Evaluated Capacity 8TB 4TB Price USD 250 USD 140 Review Link Western Digital My Book 8TB [2016] Review Western Digital My Passport 4TB [2016] Review

The technical details of the internal drives in the unit(s) are revealed by CrystalDiskInfo. We see that the helium drive used in the My Book is similar to the Ultrastar He8, but, the spindle spins slower at 5400 RPM to further reduce the power consumption. Other firmware features such as TLER (time-limited error recovery) necessary for RAID operation are disabled, making the drive unsuitable for use in RAID arrays / NAS units. In any case, it is a bit of a challenge to take out the drive from the chassis without damage to the enclosure. The My Passport, on the other hand, is based on a 5400 RPM WD Blue - the high-capacity 2.5" versions have a 15mm z-height, and ship with the bridge chip integrated on the main board. This makes it difficult for the standard hard drive monitoring tools to get all the S.M.A.R.T attributes.