WD121KRYZ

The WD121KRYZ is a 3.5-inch SATA hard drive in Western Digital’s WD Gold enterprise-class line — the manufacturer’s product page for this model titles it WD Gold Enterprise Class Hard Drive. That page lists the drive with a formatted capacity of 12TB and 256MB of cache, running at 7200 RPM with CMR recording technology.

Key figures

• Capacity: 12TB; cache: 256MB.
• Form factor: 3.5-inch; category: Internal HDD; interface: SATA.
• Spindle speed: 7200 RPM; recording technology: CMR.
• Workload rating: 550TB/year.
• Operating temperature: 5°C to 60°C; non-operating temperature: -40°C to 70°C.
• Warranty: the manufacturer states a 5-Year Limited Warranty for this model.

Where this model’s figures come from

WD121KRYZ is a single orderable part number within the WD Gold family, but it is not one of the model numbers printed in the per-model specification table of the WD Gold data sheet — that table covers other 12TB and other-capacity codes. Every figure on this page is therefore taken from the manufacturer’s product page for this specific model number, where the values are printed for the selected model, and each was re-read against that page on 2026-10-27.

What this page does and does not state

Because the data sheet carries no row for WD121KRYZ, several parameters this site publishes for other WD Gold models are deliberately not asserted here: the interface generation figure, the sector format, and whether the drive is helium- or air-filled. The sustained transfer rate is likewise not asserted — it is a figure the manufacturer’s own product page and data sheet disagree on for other models in this line. The manufacturer publishes no temperature-grade or qualification standard and no lifecycle statement for this model, so none is claimed here; a “Final Production” entry in the store navigation is a catalogue section of the manufacturer’s shop, not a status claim about this drive. Prices shown by the manufacturer’s store are not reproduced on this page.

Data source

Figures are taken from the manufacturer’s WD Gold product page at westerndigital.com, captured for model WD121KRYZ on 2026-10-27 (2,411,242 bytes, md5 d6fa0ad44b983c0b5af7e250d7cecdd5) and cross-checked against WD Gold Enterprise Class SATA HDD — Western Digital Data Sheet (©2026 Western Digital Corporation), md5 a7aca283ffdfed8069479196b05f212f, whose per-model table does not contain this model number. The manufacturer hosts its data sheets behind its own store, so no public datasheet link is claimed and the external reference points to the manufacturer product page.

Who makes it

The WD121KRYZ is made by Western Digital Corporation, a United States–headquartered data storage company that describes its mission as being the market leader in data storage. © 2026 Western Digital Corporation or its affiliates.