Western Digital
Western Digital Ultrastar DC HC550 18TB SAS 12Gb/s 7.2K RPM 512MB 3.5" internal hard drive
Enterprise 18 TB SAS drive with 7200 RPM, 512 MB cache and 2.5 million-hour MTBF for high-capacity storage
- InterfaceSAS 12Gb/s
- Capacity18TB
- RPM7200 RPM
- Cache512MB
- Form Factor3.5"
- 18 TB capacity for massive data storage
- SAS 12 Gb/s interface enables fast transfers
- 7200 RPM with 512 MB cache speeds access
- 5 million hours MTBF supports reliability
- HelioSeal 9-disk design delivers 18 TB density
18 TB SAS Enterprise Hard Drive
The Western Digital Ultrastar DC HC550 is an 18 TB internal hard drive with a SAS 12Gb/s interface, 7200 RPM spindle speed and 512 MB cache. Built on a nine-disk helium-sealed platform, it delivers a sustained transfer rate of 269 MB/s and a 2.5 million hour MTBF rating for continuous operation.
Suited for high-capacity object storage
This drive fits object storage systems that use erasure coding and need maximum density per slot. It is not suited for workloads demanding low-latency random access, single-drive desktop use, or environments that cannot accommodate a 3.5 inch SAS connection.
SAS 12Gb/s interface decides compatibility
The drive requires a backplane or controller that supports 12 Gb/s SAS signalling. Without that interface the drive cannot communicate with the host, making the SAS connection the single specification that determines whether this is the correct part.
Highlights
- 18 TB capacity for massive data storage
- SAS 12 Gb/s interface enables fast transfers
- 7200 RPM with 512 MB cache speeds access
- 5 million hours MTBF supports reliability
- HelioSeal 9-disk design delivers 18 TB density
Specifications
| Interface | SAS 12Gb/s |
|---|---|
| Capacity | 18TB |
| RPM | 7200 RPM |
| Cache | 512MB |
| Form Factor | 3.5" |
Questions about this item
Does my server or RAID controller need a SAS 12Gb/s port for this 18TB drive?
Yes, the drive uses a SAS 12Gb/s interface and requires a compatible SAS 12Gb/s HBA, RAID controller or backplane to operate.
Will the 7.2K RPM spindle speed and 512MB cache match the throughput of my existing 7.2K RPM SAS drives?
The drive delivers a sustained transfer rate of 269MB/s and 4.16ms average latency, which is typical for 7.2K RPM enterprise SAS drives.
How can I confirm the HelioSeal platform is healthy after installation?
Check SMART attributes for reallocated sector count and temperature; the drive is rated for 2.5 million hours MTBF under normal enterprise workloads.
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