{"product_id":"western-digital-ultrastar-dc-hc560-20tb-sas-0f38652-wuh722020bl5204","title":"WD Ultrastar DC HC560 20TB SAS 12Gb\/s 7200RPM 512MB Cache (512e \/ SE) Data Center 3.5-inch Internal Hard Drive - 0F38652 \/ WUH722020BL5204","description":"\u003cp\u003e0F38652 and WUH722020BL5204 are two numbers for one drive: the WD Ultrastar DC HC560, a 20TB SAS hard drive for data center arrays. 0F38652 is WD's part number. WUH722020BL5204 is the model number.\u003c\/p\u003e\n\u003ch2\u003eFast facts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 20TB in a standard 3.5-inch case\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLink:\u003c\/strong\u003e SAS at 12Gb\/s\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpin and cache:\u003c\/strong\u003e 7200 RPM with a 512MB buffer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed:\u003c\/strong\u003e up to 291 MB\/s sustained\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormat:\u003c\/strong\u003e 512e with no encryption (Base SE)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRating:\u003c\/strong\u003e 550TB of workload a year, 2.5 million hours MTBF\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat is inside\u003c\/h2\u003e\n\u003cp\u003eThe HC560 was WD's first drive with OptiNAND. A small flash drive sits beside the disks and holds the drive's metadata. That frees space on the platters, so tracks can sit closer together. WD says OptiNAND is not a hybrid design.\u003c\/p\u003e\n\u003cp\u003eNine helium-sealed disks hold 2.2TB each. Energy-assisted recording and a triple-stage actuator help reach 20TB at low power. The recording is CMR.\u003c\/p\u003e\n\u003ch2\u003eReading the two numbers\u003c\/h2\u003e\n\u003cp\u003eThe model number packs in the details. WUH is Western Digital, Ultrastar, helium. The 72 is 7200 RPM, and 20 is the capacity. B is the generation code, and L is the 26.1 mm height. The 52 means 512e SAS at 12Gb\/s. The final 4 means Base SE.\u003c\/p\u003e\n\u003cp\u003eThe self-encrypting SAS version is WUH722020BL5201, part 0F38651. SATA versions use 0F38755 and 0F38785 for Base SE, and 0F38754 and 0F38784 for self-encrypting.\u003c\/p\u003e\n\u003cp\u003eOlder listings often say HGST Ultrastar. WD now sells the line under its own name.\u003c\/p\u003e\n\u003ch2\u003ePower, noise, and rebuilds\u003c\/h2\u003e\n\u003cp\u003eWD lists 6.1 W at idle and 9.3 W under a mixed random load. Twelve drives idle near 73 W. Noise is 2.0 bels at idle and 3.2 while working. Keep air moving across the 5 to 60°C range.\u003c\/p\u003e\n\u003cp\u003eA full pass over 20TB at the rated 291 MB\/s takes about 19 hours, and a busy array takes longer. Twelve bays hold 240TB raw, and RAID 6 leaves about 200TB usable.\u003c\/p\u003e\n\u003ch2\u003e0F38652 \/ WUH722020BL5204 specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eWestern Digital\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eUltrastar DC HC560\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eModel number\u003c\/th\u003e\n\u003ctd\u003eWUH722020BL5204\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWD part number\u003c\/th\u003e\n\u003ctd\u003e0F38652\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCapacity\u003c\/th\u003e\n\u003ctd\u003e20TB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eInterface\u003c\/th\u003e\n\u003ctd\u003eSAS 12Gb\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSpindle speed\u003c\/th\u003e\n\u003ctd\u003e7200 RPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBuffer\u003c\/th\u003e\n\u003ctd\u003e512MB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSector format\u003c\/th\u003e\n\u003ctd\u003e512e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eRecording\u003c\/th\u003e\n\u003ctd\u003eCMR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSecurity\u003c\/th\u003e\n\u003ctd\u003eBase SE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSustained transfer\u003c\/th\u003e\n\u003ctd\u003eUp to 291 MB\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePower, idle \/ active\u003c\/th\u003e\n\u003ctd\u003e6.1 W \/ 9.3 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eMTBF\u003c\/th\u003e\n\u003ctd\u003e2.5 million hours (projected)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWorkload rating\u003c\/th\u003e\n\u003ctd\u003eUp to 550TB per year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e690 g max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Western Digital","offers":[{"title":"Default Title","offer_id":62810465698163,"sku":"WUH722020BL5204","price":1432.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0992\/9546\/1747\/files\/WUH722020BL5204.jpg?v=1778008074","url":"https:\/\/cpurepublic.com\/products\/western-digital-ultrastar-dc-hc560-20tb-sas-0f38652-wuh722020bl5204","provider":"CPU Republic LLC","version":"1.0","type":"link"}