WD Ultrastar DC HC520 12TB Enterprise Data Center Internal Hard Drive 0F30141 3.5-inch SATA 6 Gb/s 7200 RPM 256 MB
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Western Digital
0F30141
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WD Ultrastar DC HC520 12TB Data Center Hard Drive
12TBSATA 6 Gb/s7200 RPM550 TB/yearAFR 0.35%
The WD Ultrastar DC HC520 12TB (part number 0F30141, model HUH721212ALN600) is a 3.5-inch data center hard drive that spins at 7200 RPM, carries a 256 MB cache and sustains up to 255 MB/s over SATA 6 Gb/s. Western Digital rates it at 2,500,000 hours (projected) MTBF with an annualised failure rate of 0.35% and a workload of up to 550 TB per year, which places it in the top reliability tier of the Ultrastar data center line. Typically in stock with fast delivery across Cyprus.
Before you buy: this is a bare 3.5-inch internal drive supplied without rails, screws or cables. It uses a standard SATA 6 Gb/s connector and works in any SATA port or backplane. It is designed for a rack or server chassis with forced airflow; expect it to run warmer and louder than a desktop drive. Critical: the ALN600 suffix means this is the 4Kn native variant, which presents 4096-byte sectors rather than the usual 512-byte emulation. Modern Linux, current Windows Server releases and most enterprise RAID controllers handle 4Kn, but older hardware RAID cards, some consumer motherboards and several backup appliances do not, and a 4Kn drive generally cannot be used as a boot disk on older systems. If you need 512e, the equivalent part is the ALE600 model.
Best For
✓ Data center and cloud racks
Specified for continuous enterprise duty at 2,500,000 hours (projected) MTBF. Workload rating: up to 550 tb per year.
✓ Large RAID and JBOD arrays
Dual-stage actuator and rotational vibration handling keep throughput steady when dozens of drives share one chassis.
✓ Backup, archive and object storage
CMR recording with high sequential throughput suits large sequential writes and long retention.
✓ Standard SATA servers
Drops into any SATA backplane or motherboard port with no controller change.
Key Features
Enterprise reliability rating
2,500,000 hours (projected) MTBF with an annualised failure rate of 0.35%, specified for 24x7 operation.
Up to 255 MB/s sustained
Maximum sequential transfer rate, measured on the outer tracks of the platter stack.
550 TB per year workload
Rated for the read and write volume of a busy production array rather than a desktop or NAS.
CMR recording
Conventional magnetic recording without overlapping tracks, so random write and RAID rebuild performance stays predictable.
256 MB cache
A large DRAM buffer absorbs bursty write traffic before it reaches the platters.
Sector format 4Kn native (4096-byte sectors)
Standard enterprise formatting for compatibility with server RAID controllers and storage stacks.
Technical Specifications
| Drive | |
| Brand | Western Digital |
| Series | Ultrastar DC HC520 |
| Part Number (MPN) | 0F30141 |
| Ultrastar Model | HUH721212ALN600 |
| Form Factor | 3.5-inch internal |
| Capacity | 12TB |
| Interface | SATA 6 Gb/s |
| Rotational Speed | 7200 RPM |
| Cache | 256 MB |
| Recording Technology | CMR (conventional magnetic recording) |
| Sector Format | 4Kn native (4096-byte sectors) |
| Fill Gas | Helium (HelioSeal, fourth generation, 8-disk design) |
| Performance and Endurance | |
| Sustained Transfer Rate | Up to 255 MB/s |
| Workload Rating | Up to 550 TB per year |
| MTBF | 2,500,000 hours (projected) |
| Annualised Failure Rate | 0.35% |
| Duty Cycle | 24x7 continuous operation |
| Power and Acoustics | |
| Power (Operating) | 6.9 W |
| Power (Idle) | 5.0 W |
| Acoustics (Idle) | 2.0 Bels |
| Acoustics (Seek) | 3.6 Bels |
| Security | |
| Security Model | ISE, Instant Secure Erase. The HC520 family is also offered as a TCG SED variant under a different part number. |
| Physical and Warranty | |
| Dimensions | 26.1 x 147 x 101.6 mm |
| Operating Temperature | 5 to 60 degrees Celsius |
| Warranty | 1-Year Warranty (Singular) |
| Product Identifiers | |
| MPN | 0F30141 |
| Ultrastar Model Number | HUH721212ALN600 |
| EAN / GTIN | 0829686008069 |
Frequently Asked Questions
Will the 0F30141 work in my system?
Only if your controller and operating system support 4Kn native sectors. This part number is the 4Kn variant of the Ultrastar DC HC520, not the more common 512e version. Modern Linux, recent Windows Server and enterprise RAID controllers are generally fine; older RAID cards, consumer motherboards and some NAS appliances are not. Check before ordering, or choose the 512e ALE600 part instead.
Is the 0F30141 suitable for a RAID array?
Yes. It is built for enterprise RAID with vibration compensation and enterprise error recovery timing so it does not drop out of an array during a retry. Populate the array with matched drives for predictable rebuild times.
What is the difference between Ultrastar DC HC520 and WD Gold?
They share the same enterprise platform generation and reliability grade. Ultrastar is sold as a data center part with SAS and security variants and full enterprise documentation, while WD Gold is the SATA-only retail equivalent. For a SAS backplane you need Ultrastar.
What do I need to know before buying the 0F30141?
It ships bare with no rails, screws or cables, and it is the 4Kn native variant, so verify controller and operating system support first. It is a helium-filled data center drive designed for a rack with forced airflow, and it will run warmer and louder than a desktop disk.
Singular Expert Insight
At this capacity the practical decision is interface rather than performance: the SATA version is the pragmatic choice for a single-path server or a large JBOD where dual-port redundancy is not required. The 2,500,000 hours (projected) MTBF and the 0.35% annualised failure rate are the numbers to compare across the Ultrastar range, not the transfer rate. Browse our enterprise and server hard drives or, where latency matters more than capacity, our enterprise and server SSDs.
Buyer's Guide
Buy this if
You are populating a server, JBOD or data center rack and need an enterprise reliability rating with SATA 6 Gb/s connectivity.
Skip if
You want a quiet drive for a home NAS or desktop. WD Red Pro is the better fit there.
Also consider
WD Gold for the SATA-only retail equivalent, WD Red Pro for NAS enclosures, or an Ultrastar NVMe SSD if throughput and latency matter more than capacity per euro.
Form Factor
- 3.5",
- Internal
Interface
- SATA
Technical specifications
Μέγεθος
12TB
Χαρακτηριστικά
Product Code
1413220
EAN Code
0829686008069
Manufacturer
Western Digital