Form factor, interface and rotational speed before the capacity · review
Hitachi MegaScale DC 4000.B 4 TB (0F22146) review
A four-terabyte drive whose single bullet reprints its title word for word, publishing every mechanical figure and not one figure about what the drive is specified to withstand.
It is a European model with no Amazon.com offer on October 26, 2026. It is sold on the European Amazon stores, often with a European plug or power adapter, and a US buyer would be relying on an importer.
Models on this shelf that Amazon.com did sell on that date:
A four-terabyte internal drive in 3.5-inch form, at 7200 rpm with 64 MB of cache on a SATA 6 Gb/s interface; and a single bullet that reprints the same line, capacity, form factor, interface, cache and speed alike.
One line, printed twice
Most listings on this shelf spend five bullets describing what a drive is for. This one spends its only bullet repeating the title. Nothing is stated beyond the figures, one of which is wrong, and the page is either the most honest or the least helpful on the shelf depending on what the reader came for.
The figures that are here
Capacity, form factor, interface, cache, rotational speed. Five values, more than one rival on this shelf manages, although the speed is the seller’s and not the maker’s. A buyer who knows what they want can place this drive against another in seconds.
The figures that are not
No workload rating, no MTBF, no warranty term, no acoustic value, no consumption. Those five describe what the drive is specified to withstand and what happens when it does not, and they are the half of a drive specification that this page does not contain.
The same part number, at another speed
The title says 7200 rpm. The part number says otherwise: 0F22146 is HGST’s MegaScale DC 4000.B, model HMS5C4040BLE640, a CoolSpin drive that retailers list at 5700 rpm. The refurbished listing of the same drive in this catalog prints 5700 rpm. A buyer who needs a 7200 rpm spindle should not count on this one.
Before ordering
Take the part number to the maker’s datasheet for the workload rating and the MTBF, and ask the seller to confirm the rotational speed of the unit they hold.
Buying it in the United States
Not on Amazon.com. At our check on October 21, 2026, part 0F22146 had no American offer: the listing exists on the German, Italian and Spanish stores only, and the buy button here opens a search for the part number.
Figures from the day this page was last revised; offers and prices shift without warning.
Prices quoted in this text were read on October 21, 2026. The live price is at the top of the page.
Where it holds up, and where it stops
Strengths
Every mechanical figure a buyer needs to place the drive is printed, and printed twice
The part number appears in both the title and the bullet, which makes the maker’s own datasheet easy to find
No marketing language at all: the page is a specification line, which keeps it short and easy to check
Compromises
Not sold on Amazon.com: the listing exists on the German, Italian and Spanish stores only
The single bullet adds nothing whatever to the title, so the page has one source of information rather than two
No workload rating, no MTBF and no warranty, which leaves the entire question of specified duty unanswered
The 7200 rpm in the title contradicts the maker: part 0F22146 is a 5700 rpm CoolSpin drive, so expect the slower spindle
Specifications
Capacity
4 TB — printed in the title and again in the single bullet, in the maker’s unit. It is reported here in that unit and not converted
Form factor
3.5-inch — printed in the title and in the single bullet, both times beside the word for an internal drive
Height
Not published on the listing — no measurement in millimeters appears, and the form factor is given in inches and left there
Interface
SATA at 6 Gb/s — printed in the title and in the single bullet
Rotational speed
7200 rpm on this listing, in the title and in the single bullet. HGST sold part 0F22146 (HMS5C4040BLE640) as a 5700 rpm CoolSpin drive, and a second listing in this catalog prints 5700 rpm for it
Cache size
64 MB — printed in the title and repeated in the single bullet
Stated workload rating
Not published on the listing — no annual figure in terabytes appears, and the page has no sentence about duty at all
Warranty length
Not published on the listing — no term of any length appears in the title or in the single bullet
Stated MTBF
Not published on the listing — no figure in hours appears anywhere on the page
Stated acoustic figure
Not published on the listing — no decibel value appears, and the page carries no claim about noise to stand in its place
Stated idle power
Not published on the listing — no figure in watts appears, and consumption is never raised
Market
European listing: no offer on Amazon.com, where the button opens a search for the part number
Amazon reference
B0856PW8RX
EAN
0714752534439
On Amazon.com
It is a European model with no Amazon.com offer on October 26, 2026.
Where this unit differs
Put against the median of its own group on this site — not against every network product sold.
Cache size64 MB — printed in the title and repeated in the single bullet-75 % against the median of this group
Capacity4 TB — printed in the title and again in the single bullet, in the maker’s unit. It is reported here in that unit and not converted-50 % against the median of this group
The questions that come up before an order
Is it really a 7200 rpm drive?
Almost certainly not. Part number 0F22146 is HGST’s MegaScale DC 4000.B (HMS5C4040BLE640), a CoolSpin drive retailers list at 5700 rpm, and the refurbished listing of the same part in this catalog prints 5700 rpm too. The 7200 in this title is the seller’s figure, not the maker’s.
Can I buy it in the United States?
Not from Amazon.com. At our check on October 21, 2026, the part had no American offer, and retailers list the line as end of life. On this shelf, the White Label 3 TB at 7200 rpm sold for $109.95 on Amazon.com that day, and the Seagate BarraCuda 8 TB for $278.97.
Why publish a form factor in inches and no height in millimeters?
Because a 3.5-inch drive has one common height and a bay for it assumes that height. The measurement matters far more on 2.5-inch drives, where 7 mm (0.28 in) and 15 mm (0.59 in) bodies both exist and a laptop bay will only take one of them. On a desktop drive the inch figure usually settles it, and this page never leaves the desktop.
What is missing when a drive publishes no workload rating?
The duty it is specified for. A workload rating states how much reading and writing per year the maker designs the drive around, and it is what separates a drive meant for continuous service from one meant for a desktop that sleeps at night. Without it, the mechanical figures say how fast the drive is and nothing about how hard it may be worked.
Our score
7.2/ 10
A page with no marketing on it at all, which is refreshing until the figures run out. Everything mechanical is stated; everything about specified duty and support is absent, and the same part number appears elsewhere at another speed.
The buyer this one serves, among network and storage gear
A bulk volume in a desktop machine where the drive will not be pushed hard, bought by someone comparing on figures alone and getting the rest from the datasheet.
What this one costs among network and storage gear
A reference exists on these Amazon stores: Germany, Italy, Spain. Listed is not the same as in stock — availability changes daily.
Details checked on October 21, 2026.
Sources
Specifications: the manufacturer sheet for network and storage gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
8 TB · 3.5-inch · height not published, 26 mm (1.02 in) recorded · SATA 6 Gb/s · rotational speed not published · cache not published · 190 MB/s sustained at the outer diameter · no workload rating · no warranty · no MTBF · no acoustic figure · no idle power · 630 g (22.2 oz)
The cheapest terabyte on this shelf at $35.00 on Amazon.com on October 26, 2026, and the only listing here that states its packaging — with a 190 MB/s sustained rate and no rotational speed.
Best for: Bulk storage filled once, where sustained read speed is the figure that matters
4 TB · 3.5-inch · 7200 rpm · CMR · 256 MB cache · SATA 6 Gb/s · 300 TB per year workload · 255 MB/s sustained
A 4 TB, 7200 rpm desktop drive whose listing prints CMR in the title, a 300 TB a year workload, 255 MB/s sustained and a 5-year limited warranty plus 3 years of Rescue data recovery.
Best for: A desktop machine that writes a great deal — video work, large game libraries, editing scratch space — where the recording method and the annual duty both need to be known before purchase.
A ten-terabyte drive from Toshiba’s Enterprise Capacity range, sold refurbished as a Dell version through Amazon Renewed with a one-year limited warranty; no workload rating or MTBF is published.
Best for: A machine that needs the most capacity per bay on this shelf, for a buyer who accepts a refurbished drive and keeps a backup elsewhere — once a US offer exists.
