Close

Western digital ultrastar dc hc555 0b47749 20TB data center HDD 3.5" sas 12GB/s 7200rpm 512mb cmr

Product image: Western digital ultrastar dc hc555 0b47749 20TB data center HDD 3.5" sas 12GB/s 7200rpm 512mb cmr-null
Product image: Western digital ultrastar dc hc555 0b47749 20TB data center HDD 3.5" sas 12GB/s 7200rpm 512mb cmr-null
Product image: Western digital ultrastar dc hc555 0b47749 20TB data center HDD 3.5" sas 12GB/s 7200rpm 512mb cmr-null
Product image: Western digital ultrastar dc hc555 0b47749 20TB data center HDD 3.5" sas 12GB/s 7200rpm 512mb cmr-null
Product image: Western digital ultrastar dc hc555 0b47749 20TB data center HDD 3.5" sas 12GB/s 7200rpm 512mb cmr-null
WESTERN DIGITAL
🔥Selling fast!

Western digital ultrastar dc hc555 0b47749 20TB data center HDD 3.5" sas 12GB/s 7200rpm 512mb cmr

€1,600.48
or
Pay in 3, 6 or 9 interest-free monthly installments and 0 service fees with Fleksy image
Select Color: Grey
In stock
–+
–+
3200
Points earned
You can earn Antamivi points every time you make a payment using your Bank of Cyprus cards.
The number of Antamivi points and the corresponding amount of money displayed are indicative and may vary from time to time. Want to know more? Check out our FAQs here.
If you are an eligible member of the Bank of Cyprus loyalty scheme Pronomia, you will receive additional Antamivi points based on your assigned tier.
From: Singular Computers Systems LTD
Buy more from this shop
Delivery options
Pick-up points / Lockers
Est. delivery: 03 Aug - 04 Aug
Free
Delivery to your door
FREE shipping on orders over €85.00 from Singular Computers Systems LTD
Est. delivery: 03 Aug - 05 Aug
Free

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

Will the 0B47749 work in a SATA port?
No. It is a SAS 12GB/s drive and needs a SAS controller, HBA or SAS backplane. SAS ports can host SATA drives, but SATA-only ports cannot run a SAS drive — check your server or RAID controller before ordering.
Is the HC555 a CMR or SMR drive?
It uses CMR (conventional magnetic recording) with ePMR, so it delivers consistent write performance and full RAID compatibility — unlike SMR drives, which can slow under sustained writes.
Does it work in a standard server or RAID array?
Yes, on any SAS 12GB/s controller, HBA or backplane that supports 20TB drives. It also supports dual-port operation for redundant paths in high-availability arrays.
What do I need to know before buying?
It is a bare internal 3.5-inch SAS drive with no mounting kit or cables, and it ships unformatted for initialisation in your host. Typically in stock with fast delivery across Cyprus.
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