Seagate 4TB Expansion and Backup Plus

This is the first in a series of posts regarding a new server build one is working on. The current local server, a HP Proliant Microserver (Gen 7 with a N40L) is four years old. While it can still handle print and file serving, it is having issues with its newer tasks. Specifically, transcoding Plex streams to Chromecasts and Fire TVs is a stuttering affair.

To start the build, one needs to have a case. Finding a good quality rackmount case, with hot swappable drive bays, at a reasonable price leaves just one option, the Supermicro SC216. The problem with the SC216 is it has 24 drive bays for 2.5″ drives. Most manufacturer’s only have 2TB drives in the 2.5″ formfactor. However, there is the ST4000LM016 made by Seagate.

4TB in a 15mm Tall 2.5″ Drive

The ST4000LM016 is a 4TB 5400RPM hard drive in the 15mm tall 2.5″ form-factor. While 15mm is too thick to fit into a laptop, it is the standard height of 2.5″ enterprise drives that typically reside in the SC216. According to Seagate’s datasheet, the ST4000LM016 has a SATA 6Gb/s interface, 128MB of cache, and can sustain 130MB/s transfers.

In regards to power, the ST4000LM016 consumes 2.1W of power when writing, 1.9W when reading and 0.85W when idle. This sure beats the 5.1W write/read and 1.1W when idle that the 10K RPM VelociRaptor consumes. It is a little more power hungry than the 2.5″ WD Red series drives. But, the 2.5″ WD Red series tops out at 2TB, so overall system power will be lower for the same capacity.

Then, there is the price. The ST4000LM016 retails just north of 200USD. However, there is another way to acquire these drives.

The 4TB Backup Plus and 4TB Expansion

Seagate 4TB Backup Plus to the left and 4TB Expansion to the right.

Seagate 4TB Backup Plus to the left and 4TB Expansion to the right.

Seagate’s 4TB Backup Plus and 4TB Expansion are both “portable” external hard drives. They sport a USB 3.0 interface, and contain a 2.5″ hard drive, the ST4000LM016. These external drives retail for 124USD and 119USD respectively. And, both have frequently been on sale for 110USD or less with promocodes.

At a Glance Comparison

4TB Backup Plus 4TB Expansion
Model Number STDR4000901 STEA4000400
Form-factor 2.5″ Portable 2.5″ Portable
Interface USB 3.0 USB 3.0
Internal Drive ST4000LM016 ST4000LM016
Warranty (US) 2 year 1 year
Extras 200GB One Drive for 2 years None
Price ~124USD ~119USD

Unlike what Western Digital has done with its passport series, Seagate has yet to integrate the USB 3.0 controller into the drive controller board. Thus, inside every 4TB Backup Plus and 4TB Expansion lies a ST4000LM016 waiting to be shucked from its enclosure.

Shucking likely voids the drive’s warranty. But, at a cost savings of about 50%, purchasing extras for replacements will still be cheaper than paying retail prices—honestly, if the drives have a 50% failure rate, they’re not worth using anyways.


The Seagate 4TB Backup Plus with the lid removed.

The Seagate 4TB Backup Plus with the lid removed.

The Backup Plus enclosure consists of a plastic base with a metal lid. The top is secured with retention clips in the plastic base along with double sided tape along the perimeter. Inside, the drive faces up towards the lid.

The Seagate 4TB Expansion with the lid removed.

The Seagate 4TB Expansion with the lid removed.

The Expansion enclosure consists of a plastic base with a plastic lid. The lid is secured with retention clips that are molded into it. In an interesting twist, inside, the drive faces down towards the bottom of the base.

Build Quality

In general, the Backup Plus’ build quality is better than the Expansion’s. The Backup Plus feels like it can survive a fall, while the Expansion’s enclosure feels like it would crack from any substantial drop.

The little rubber drive support in the Seagate 4TB Expansion.

The little rubber drive support in the Seagate 4TB Expansion.

While the lid is difficult to remove from the Expansion enclosure, the drive rests on small rubber nubs that fit into molded channels in the base. The lid contains a feature that secures the drive’s support nubs against the base. Once the lid is removed, the drive can be dumped out by turning the base over.

The Backup Plus’ lid is easier to remove due to the way it overlaps the body. It can be removed using only fingernails and a little pressure. Within the enclosure, the drive is supported by four rubber spacers that go from the bottom of the base to the inside of the lid. To remove the drive, one of the rubber supports needs to be pulled up.

Drive Shucking

Before attempting to remove a drive from its external enclosure, it should be extensively tested for errors—shucking will void the drive’s warranty. In Linux, the badblocks utility can be used. For this drive, it will take badblocks about 24 hours to complete a full run of a single test pattern.

Once the drives have been removed from their housing, they still need to be separated from their USB 3.0 to SATA converter board. But to do this, first some foil tape must be removed. The Expansion has just a couple of inches of foil tap securing the converter board to the drive. This can be removed very easily. The Backup Plus all but the top lid of the drive in foil tape, which is more of an ordeal to remove.

After removing the foil tape, the USB 3.0 to SATA converter board can be removed. One interesting thing to note, while the two enclosures use the same drive, they use two slightly different converter boards. This is primarily due to the differing orientation of the drives within their enclosures.

At this point the drive from the Backup Plus is ready to use. The drive from the Expansion still needs its mounting screws removed. To do this, first the four round, black, vibration dampening rubber covers need to be removed from the screws. Then, using a Phillips screwdriver, the four mounting screws can be removed.


The ST4000LM016 is the highest density hard drive available in the 2.5″ form factor at the moment. While its retail price is a little steep, it can be shucked from two different enclosures which are both readily available and much cheaper.

Overall, the Backup Plus is a better value. Of the two, the Backup Plus is the easier one to take apart. If one desired a 4TB portable USB 3.0 drive, the Backup Plus is more likely to hold up to travel better. Additionally, it includes 200GB of OneDrive storage for 2 years—icing on the cake for those who use OneDrive.

-John Havlik

[end of transmission, stay tuned]