WD Ultrastar DC HC590: 24TB and 26TB Side by Side, and the 0F Part Numbers

Ultrastar DC HC590 24TB and 26TB side by side

The sheet runs four columns, one for each capacity on each interface, and only some of its rows move between them. Here the capacities sit next to each other. Where a cell holds two values with a slash, the first is SATA 6 Gb/s and the second SAS 12 Gb/s.

Beyond the model pattern, three rows separate the two sizes. The 26 TB has the higher areal density and 15 MB/s more sustained transfer, and because idle watts hold steady, its idle power per terabyte comes out lower. WD places that transfer maximum about 10% into the capacity. By our arithmetic, it means no full write can beat about 23.2 hours at 24 TB or 23.9 hours at 26 TB, so the larger drive's extra speed does not quite cover its extra space.

SATA against SAS moves power by the same 0.3 W at idle and under random load, at both sizes, while the sustained figure stays put. The sheet gives the interface maximum as 600 or 1200 MB/s, well above either sustained figure. What settles the interface is what your controller or backplane takes, and that is a question for your own system's documents.

WD Ultrastar DC HC590 part numbers: 0F65672, 0F65642 and six more

The data sheet carries no 0F numbers. WD's en-gb product page does, and it describes each one by capacity, interface and a label of SE or TCG. This grid copies that map.

So a search for WD Ultrastar DC HC590 0F65672 is after the 26 TB SATA drive with the SE label, and 0F65642 is the 24 TB SATA drive with the TCG label. The numbers do not sort neatly by interface or capacity, and the two SE SAS numbers start 0F59 where the other six start 0F65, so copy the whole string rather than judging from its first digits.

The labels need a word of explanation. The page uses SE and TCG, whilst the sheet's key uses Base (SE) and SED. We read SE as Base (SE), with no encryption, and TCG as SED, a self-encrypting TCG-Enterprise drive. That is our reading, and the evidence for it is on the page: its spec blocks put SE on strings ending 4 and TCG on strings ending 1, which the key decodes as Base (SE) and SED. We have not found a WD statement that says so in terms.

Reading WUH722624 and WUH722626: the Ultrastar DC HC590 model key

Model numbers on the sheet stop at a pattern, with the last four characters left open. WD's key fills them in:

• The capacity field reads 24 for 24 TB and 26 for 26 TB. A is the generation code and L the 26.1 mm z-height.
• xx is the interface: E6 is 512e SATA 6 Gb/s, 52 is 512e SAS 12Gb/s.
• y is the pin 3 status: 0 is Power Disable support, L is the legacy configuration with no Power Disable.
• z is the security mode: 0 is Instant Secure Erase (ISE), 1 is SED, 4 is Base (SE) and 5 is SED-FIPS, a self-encrypting TCG Enterprise FIPS drive.

WD's en-gb page prints all eight complete strings in spec blocks, each with a capacity and a security label, in the same order as its part-number list. It does not print a string beside a 0F number, and each block's Interface field lists both SAS and SATA. So the pairing below is our reading: order from the page, interface from the key's E6 and 52.

The key is wider than the part-number list. It names four security modes, but WD's en-gb page lists only SE and TCG, and we found no ISE or SED-FIPS 0F number on it. If you need one of those modes, get the exact part number confirmed in writing before you buy.

WD Ultrastar DC HC590 prices on Amazon.co.uk

This table takes the Amazon.co.uk listings we identify as the HC590 generation, lowest pounds per TB inc VAT first, with capacity as a column. It holds 1 listing right now. If your capacity or interface has no row, the table holds none at this moment. The part number or model prefix is what links a listing to the sheet's figures: a WUH722624 or WUH722626 string in a title does that as well as a 0F number. If a row prints neither, get the number from the seller before you press Buy on Amazon.

The sheet states CMR for all four variants, whilst CMR in an Amazon title is a claim by whoever wrote that title. The Recording column prints a technology only where a document ties it to the part number. A row without one marks our sourcing gap and is no finding about the drive.

WD's product page states a 5-Year Limited Warranty and sends readers to its support site for regional specific warranty details. We have not found a WD document setting out UK terms for the HC590, or one saying that warranty reaches a used row, so ask the seller who takes a claim.

In-stock alternatives

None of these is the product this page covers: they are what is in stock on Amazon.co.uk beside it right now. Each row says why it is listed. Check the interface, form factor and part number against your system before buying.

Ultrastar DC HC590 datasheet: what else it states

The sheet is dated October 2024 and calls its contents sample specifications that are subject to change and do not constitute a warranty. These lines apply to all four variants:

• Workload: rated for 550 TB a year.
• Error rate: 1 in 10^15 bits read, non-recoverable. Load/unload cycles: 600,000 at 40°C. Availability: 24x7.
• Size: 26.1 mm (1.03 in) high, 146.7 mm long, 101.6 mm wide.
• Operating limits: 5°C to 60°C (5°C ambient, 60°C device-reported), 40 G shock with a 2 ms half-sine wave, 0.7 G RMS vibration from 5 to 500 Hz.
• Non-operating limits: -40°C to 70°C, 200 G shock, 1.04 G RMS vibration from 2 to 200 Hz.

Check the acoustics label. This sheet prints its row as Operating/Idle (Bels, typical), 3.2/2.5, the reverse of the Idle/Operating order on the HC580 sheet. We have read it as labelled, which makes 2.5 the idle figure, but the order is worth bearing in mind if you set it beside another sheet.

The headline claims are WD's, and we have not tested them. It calls this the world's first 11-disk HDD platform. It pairs those disks with energy-assisted Perpendicular Magnetic Recording (ePMR), which it says raises tracks per inch. Rotational Vibration Safeguard uses dual sensors against disturbances, and Dynamic Fly Height is named for shock. OptiNAND uses integrated iNAND flash for housekeeping functions. ArmorCache is presented as a choice: write cache disabled for random write performance, or enabled to protect cached data on an emergency power off.

WD also says HelioSeal gives one of the lowest power profiles in the industry, but the sheet holds no comparison table to test that against, so the watt rows above are the better guide. Its footnotes call the MTBF and AFR values projected, assume a typical workload at 40°C, derate them up to 550 TB a year and 60°C, and say they do not predict an individual drive's reliability. WD aims the drive at hyperscalers and big data, AI training pools, cloud repatriation data pools, cloud service providers and converged infrastructure. None of that tells you it suits one specific system.

How the HC590 differs from the HC580

The HC580 holds 22 TB and 24 TB on ten disks, so the two overlap only at 24 TB, where its sheet states 298 MB/s against 287 MB/s and 0.1 W less at idle. The HC590's distinct offer on WD's sheets is 26 TB and the wider key. The row-by-row 24 TB comparison is on WD Ultrastar 24TB, and the other family's own figures are on Ultrastar DC HC580.