{"product_id":"western-digital-ultrastar-dc-hc550-16tb-sas-hard-drive-0f38357","title":"WD Ultrastar DC HC550 16TB SAS 12Gb\/s 7200RPM 512MB Cache (512e \/ SE) 3.5-inch Internal Hard Drive - 0F38357","description":"\u003cp\u003eThe WD Ultrastar DC HC550 0F38357 is a 16TB SAS hard drive for data center arrays and storage servers. WD's model number for it is WUH721816AL5204. It spins at 7200 RPM, links at 12Gb\/s, and carries a 512MB buffer.\u003c\/p\u003e\n\u003cp\u003eAt launch, the HC550 was the first hard drive with energy-assisted recording. It was also the first with a triple-stage actuator. Nine helium-sealed disks sit inside the case. The 16TB size is the middle step of a 14, 16, and 18TB range.\u003c\/p\u003e\n\u003cp\u003eRotational Vibration Safeguard keeps speed steady when many drives share a chassis. Media Cache Plus helps random writes.\u003c\/p\u003e\n\u003ch2\u003eWhere the HC550 sits in the Ultrastar line\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003cth\u003eSizes\u003c\/th\u003e\n\u003cth\u003eDisks\u003c\/th\u003e\n\u003cth\u003eHeadline feature\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eHC550 (this drive)\u003c\/th\u003e\n\u003ctd\u003e14, 16, 18TB\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003eEnergy-assisted recording\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eHC560\u003c\/th\u003e\n\u003ctd\u003e20TB\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003eFirst OptiNAND\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eHC570\u003c\/th\u003e\n\u003ctd\u003e22TB\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003eSecond-generation OptiNAND\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eHC580\u003c\/th\u003e\n\u003ctd\u003e22, 24TB\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e2.4TB per disk\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eNewer models hold more per bay. If your array already runs 16TB drives, the HC550 keeps spares simple, because every drive matches.\u003c\/p\u003e\n\u003ch2\u003ePower, noise, and rebuilds\u003c\/h2\u003e\n\u003cp\u003eWD lists 5.8 W at idle and 8.8 W when active. Twelve drives idle near 70 W. Noise is 2.0 bels at idle and 3.6 while working. A full pass over 16TB at the rated 262 MB\/s takes about 17 hours, and a busy array takes longer.\u003c\/p\u003e\n\u003cp\u003eThe 12Gb\/s link has spare room, since the drive tops out at 262 MB\/s. That room matters most when several drives share one expander lane.\u003c\/p\u003e\n\u003ch2\u003ePick the right 16TB part number\u003c\/h2\u003e\n\u003cp\u003eThe 16TB SAS drive comes in three versions. 0F38357 has no encryption. It supports overwrite-based Sanitize. 0F38356 is the self-encrypting version. 0F38358 adds FIPS certification. SATA versions use 0F38462 and 0F38461.\u003c\/p\u003e\n\u003cp\u003eSAS models can format to 512, 520, or 528 bytes per sector. Some arrays need those sizes.\u003c\/p\u003e\n\u003cp\u003eThe model number WUH721816AL5204 reads easily too. The 16 is the capacity. The 52 marks 512e SAS at 12Gb\/s. The final 4 means Base SE, with no encryption.\u003c\/p\u003e\n\u003ch2\u003e0F38357 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 HC550\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eModel number\u003c\/th\u003e\n\u003ctd\u003eWUH721816AL5204\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWD part number\u003c\/th\u003e\n\u003ctd\u003e0F38357\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCapacity\u003c\/th\u003e\n\u003ctd\u003e16TB\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\"\u003eRecording\u003c\/th\u003e\n\u003ctd\u003eCMR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSustained transfer\u003c\/th\u003e\n\u003ctd\u003eUp to 262 MB\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePower, idle \/ active\u003c\/th\u003e\n\u003ctd\u003e5.8 W \/ 8.8 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":62814080794995,"sku":"0F38357","price":1243.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0992\/9546\/1747\/files\/WUH721816AL5204_63021905-742e-431f-bd90-4d02a7a453b8.webp?v=1778089265","url":"https:\/\/cpurepublic.com\/products\/western-digital-ultrastar-dc-hc550-16tb-sas-hard-drive-0f38357","provider":"CPU Republic LLC","version":"1.0","type":"link"}