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Western digital ultrastar dc hc555 0b47749 20TB data center HDD 3.5" sas 12GB/s 7200rpm 512mb cmr
€1,600.48
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Description
Item No.
a83f4aa9-094d-4c2b-9549-655f90a7069f
WD Ultrastar DC HC555 0B47749 — 20TB SAS Data Center HDD
20TBSAS 12GB/s7200 RPMePMR CMR
The Western Digital Ultrastar DC HC555 0B47749 is a 20TB data-center-class 3.5-inch hard drive with a native SAS 12GB/s interface, built for high-availability enterprise storage. Its helium-sealed ePMR CMR platform with OptiNAND spins at 7200 RPM with a 512 MB cache and delivers up to 280 MB/s. Identified by part number 0B47749 (EAN 0829686009363), it is rated for 550TB/year workloads and a 2.5-million-
Attributes
Hdd General Characteristics
- Disk Type: SAS
- Storage Capacity: 20 TB
- Form Factor: 3.5-inch
Details
WD Ultrastar DC HC555 0B47749 — 20TB SAS Data Center HDD
20TBSAS 12GB/s7200 RPMePMR CMR
The Western Digital Ultrastar DC HC555 0B47749 is a 20TB data-center-class 3.5-inch hard drive with a native SAS 12GB/s interface, built for high-availability enterprise storage. Its helium-sealed ePMR CMR platform with OptiNAND spins at 7200 RPM with a 512 MB cache and delivers up to 280 MB/s. Identified by part number 0B47749 (EAN 0829686009363), it is rated for 550TB/year workloads and a 2.5-million-hour MTBF. Typically in stock with fast delivery across Cyprus.
Compatibility & Setup
This is a bare internal 3.5-inch drive with a SAS 12GB/s interface — it requires a SAS controller, HBA or SAS backplane and will NOT connect to SATA-only motherboard ports (SAS ports accept SATA drives, but not the reverse). SAS also enables dual-port redundant paths for high-availability arrays. No mounting screws or cables are included, and the drive ships unformatted for initialisation in your host.
Best For
✓Enterprise and hyperscale data centres
✓SAS servers, RAID controllers and JBOD
✓Dual-port redundant-path SAS arrays
✓24/7 high-intensity multi-user storage
✓Backup, archival and cold-tier storage
✓Dense multi-bay high-availability chassis
Key Features
Native SAS 12GB/s dual-port
A SAS-3 12GB/s interface with dual-port capability provides redundant data paths and high throughput for enterprise servers and high-availability JBOD arrays.
ePMR CMR recording
Energy-assisted perpendicular magnetic recording (ePMR) improves write consistency and areal density while keeping standard CMR compatibility — no SMR write penalty.
OptiNAND + ArmorCache
Embedded iNAND flash stores drive metadata for higher density and data protection, while ArmorCache safeguards the write cache during unexpected power loss.
Data-center reliability
Rated for 550TB/year workloads and a 2.5-million-hour MTBF, backed by a 5-year limited warranty for continuous 24/7 duty.
Technical Specifications
| Identification | |
| Brand | Western Digital |
| Series | Ultrastar DC HC555 |
| Part Number | 0B47749 |
| EAN / GTIN | 0829686009363 |
| MPN | 0B47749 |
| Capacity & Format | |
| Capacity | 20TB |
| Form Factor | 3.5-inch internal |
| Recording | CMR via ePMR — energy-assisted perpendicular magnetic recording |
| Platform | Helium-sealed |
| Sector Format | 512e — 512-byte emulated |
| Interface & Performance | |
| Interface | SAS 12GB/s (SAS-3), dual-port |
| Rotational Speed | 7200 RPM |
| Cache | 512 MB |
| Sustained Transfer | Up to 280 MB/s |
| Enhancements | OptiNAND, ArmorCache |
| Reliability | |
| MTBF | 2,500,000 hours |
| Rated Workload | 550TB/year |
| Non-recoverable Errors | 1 in 10^15 bits read |
| Load/Unload Cycles | 600,000 |
| Warranty | 5-year limited |
| Power & Physical | |
| Read/Write Power | ~7.6 W (typical) |
| Idle Power | ~5.9 W (typical) |
| Dimensions (L×W×H) | 147 × 101.85 × 26.11 mm |
| Weight | ~670 g |
| Operating Temp | 5–60 °C |
Frequently Asked Questions
Singular Expert Insight
The Ultrastar DC HC555 is Western Digital’s current-generation data-centre drive, and this SAS variant suits high-availability servers that need dual-port redundancy rather than single-port SATA. Choose it when your chassis is SAS-based; for SATA servers or NAS the SATA HC555 or WD Gold costs less. Building out an array? Pair it with matching drives from our enterprise/server HDD range. For latency-critical tiers, an enterprise SSD is the complement.
Buyer’s Guide
Buy it if
Your server or JBOD is SAS-based and needs 20TB per bay
You want dual-port redundancy for high availability
You need 550TB/yr workload and a 5-year warranty
Skip it if
Your system only has SATA ports — choose a SATA drive
You need higher capacity — see HC570 22TB / HC580 24TB
You need sub-millisecond latency — choose an enterprise SSD
Also consider
WD Ultrastar DC HC555 20TB SATA (0B48724) for SATA systems
WD Ultrastar DC HC580 24TB SAS for more capacity
Seagate Exos X20 20TB as an alternative