WD Ultrastar DC HC555 20TB 3.5" Enterprise HDD, SATA 6Gb/s, 7200rpm, 512MB Cache, 512e, SED Self-Encrypting
Brand:
Western Digital
WD Ultrastar DC HC555 20TB 3.5" Enterprise HDD, SATA 6Gb/s, 7200rpm, 512MB Cache, 512e, SED Self-Encrypting
€1971.6 inc. VAT
0B48719
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WD Ultrastar DC HC555 20TB SATA SED Enterprise Hard Drive
20 TBSATA 6Gb/s7200 rpm · 512 MB cacheSED (TCG Enterprise)
The WD Ultrastar DC HC555 20TB (WD part 0B48719) is a 3.5-inch, 7200 rpm enterprise hard drive with a SATA 6Gb/s interface, 512e sector format and self-encrypting drive (SED) security, rated for 24/7 operation in servers, storage arrays and high-capacity NAS. It is meant for IT teams building capacity storage where data-at-rest encryption is required.
The helium-sealed HelioSeal design delivers up to 285 MB/s sustained transfer, 512 MB cache, a 550 TB/year workload rating and 2.5 million hours MTBF, backed by a 5-year limited manufacturer warranty.
Before you order: This is the SED (self-encrypting, TCG Enterprise) SATA version. Some hardware RAID controllers or NAS systems only support SED features with specific firmware — check your controller list; the drive also works as a normal SATA disk without encryption management.
What's in the Box
- 1 × WD Ultrastar DC HC555 20TB 3.5" SATA SED hard drive (bare drive)
- No cables, screws or mounting tray included
What It Means in Practice
- 20 TB in one 3.5" bay reduces the number of drives (and power and slots) needed for a given capacity.
- SED with TCG Enterprise and Sanitize/Crypto Erase lets you securely retire a drive in seconds, useful for compliance and disposal.
- 550 TB/year workload and 24/7 rating suit servers and arrays, not just occasional backup use.
- 512e sector format is compatible with standard operating systems and RAID controllers.
What Will Not Work
- It is not a SAS drive — it will not connect to SAS-only backplanes that lack SATA support (SAS controllers usually accept SATA).
- It is a bare internal drive: no USB enclosure, cables or caddy.
- SED management is not automatic; without a supporting controller or software it behaves as an unencrypted-key drive.
- It is a CMR hard disk, not an SSD — random IOPS are far lower than flash.
Key Features
20 TB HelioSeal
Helium-sealed 7200 rpm platform with up to 285 MB/s sustained transfer.
SED security
Self-encrypting drive, TCG Enterprise with Sanitize and Crypto Erase.
Enterprise reliability
2.5M hours MTBF, 0.35% AFR, 550 TB/year workload, 24/7.
5-year warranty
Manufacturer limited warranty of 5 years.
Technical Specifications
Frequently Asked Questions
Singular Expert Insight · Buyer's Guide
Choose the SED variant only if your controller or policy actually uses self-encryption; otherwise the standard SE version is the simpler choice. Compare other capacities in our enterprise HDDs range.
✓ Buy it if you need 20 TB SATA capacity with data-at-rest encryption for servers or arrays.
✕ Skip it if your backplane is SAS-only or you need SSD-level IOPS.
→ Also consider the SAS version of the Ultrastar DC HC555 for SAS backplanes.
Not sure your server or NAS supports 20 TB SED drives? Send us the model and we will check compatibility before you order.
Features - Western Digital - 0B48719
Interface
- SATA
More Details
Product Code
CO43394
EAN Code
0829686009462
Manufacturer
Western Digital
Technical specifications
Capacity
20TB