EMC 118000824-02 Isilon 12TB 7.2K SAS 3.5" 12Gbps 4K SED FIPS Hard Drive | WD HUH721212AL4205
EMC part 118000824-02 is a 12TB 7,200 RPM SAS hard drive for EMC Isilon storage. The drive inside is the Western Digital Ultrastar DC HC520, model HUH721212AL4205.
What the model number says
In Western Digital’s model code, the 42 marks a 4Kn SAS 12Gb/s interface and the final 5 marks TCG encryption with FIPS, a SAS-only option. The SAS models support 4Kn sector sizes of 4096, 4112, 4160 and 4224 bytes.
Drive design
The HC520 is a helium-filled 3.5-inch drive using traditional perpendicular magnetic recording (PMR), with fourth-generation HelioSeal technology and an 8-disk design. It has a 256MB data buffer, a 4.16ms average latency and a typical sustained transfer rate of 255 MB/s. The interface transfer rate on the SAS models is up to 1,200 MB/s.
Power and reliability
SAS models draw 10.1W operating and 6.1W at idle. Western Digital rates the HC520 for 2.5 million hours MTBF, a 0.35% annualized failure rate, 600,000 load/unload cycles and workloads up to 550TB per year. The non-recoverable read error rate is 1 in 10^15 bits.
Physical
The drive is 26.1mm high, weighs up to 660g and operates from 5°C to 60°C ambient.
