10TB WD Red (WD100EFAX) Hard Disk Drive Review

Page 2 : The 10TB WD Red NAS Drive, HelioSeal Technology, SATA 6 Gb/s

The 10TB WD Red NAS Drive

Despite featuring a hermetically-sealed chassis, the 10 TB WD Red (WD100EFAX) drive looks deceptively like any other 3.5″ hard disk drive. In fact, it even sports the same printed label on the top plate, with an uncovered PCB on the underside.

The label has a lot of important information, like the hard disk drive model, storage capacity as well as its date and place of manufacture. This particular drive was manufactured in Thailand on the 1st of April, 2017. You can also see that the drive uses the Advanced Format Technology to achieve its high storage density.


HelioSeal Technology

The 10 TB WD Red (WD100EFAX) NAS-optimised drive is one of the few hard disk drives in the market to feature the revolutionary HGST HelioSeal technology. It is hermetically sealed at the factory, and filled with helium.

Instead of a breather hole that is present in all “air-filled” hard disk drives, it has two sealed ports that are used to extract air from inside the chassis, and replacing it with helium.

Because helium is only 1/7th the density of “regular air”, it allows for less friction conferring the following benefits :

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  • The lower friction reduces the amount of power required to spin the platters, reducing both energy costs and thermal output.
  • Internal turbulence is greatly reduced, which makes tracking more precise and reliable. This indirectly allows for greater areal density.
  • The lower power requirement and internal turbulence allow more platters and heads to be added in the same volume of space.
  • The completely sealed environment eliminates reliability issues that can occur if breather filters get clogged up with dirt.

The only things stopping helium-filled drives from becoming mainstream are the relatively high cost of helium, and the difficulty in sealing the drive.


SATA 6 Gb/s

This is a Serial ATA drive, with native support for SATA 6 Gb/s. However, it is backward-compatible so you will have no problem using it with older SATA 3 Gb/s controllers.

The SATA 6 Gb/s interface is necessary for optimal performance since the 10 TB WD Red (Lowest Price) NAS drive boasts a maximum sustained internal (platter-to-buffer) transfer rate of 210 MB/s, and a large and fast DDR3 SDRAM cache.

Like all Serial ATA drives, it comes the standard SATA data (left) and power (right) connectors and is hot-pluggable. That means you can connect and disconnect this hard disk drive to the server, computer or NAS while it’s still running.

Next Page > Under The PCB, Testing The Drive


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