{"product_id":"dell-18tb-sas-hard-drive-r20gg","title":"Dell 18TB SAS 12Gb\/s 7200RPM 512MB Cache (512e \/ ISE) 3.5-inch Internal Hard Drive - R20GG \/ 0R20GG","description":"\u003cp\u003eDell part R20GG is an 18TB SAS hard drive for PowerEdge servers. It spins at 7200 RPM, carries a 512MB cache, and links at 12Gb\/s. Dell prints the number as 0R20GG on many labels. It is the same part.\u003c\/p\u003e\n\u003ch2\u003eOne drive, several names\u003c\/h2\u003e\n\u003cp\u003eParts sellers cross-reference the R20GG to the WD Ultrastar DC HC550 18TB SAS drive, WD model WUH721818AL5200. WD's model key explains the ending. The 52 means 512e SAS at 12Gb\/s. The final 0 means Instant Secure Erase.\u003c\/p\u003e\n\u003cp\u003eThat link lets you read WD's data sheet for the numbers Dell doesn't publish. Treat those figures as a close guide, since Dell sets its own firmware.\u003c\/p\u003e\n\u003ch2\u003eWhat WD lists for the HC550 18TB SAS\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSustained speed up to 269 MB\/s\u003c\/li\u003e\n\u003cli\u003e5.8 W at idle and 8.8 W when active\u003c\/li\u003e\n\u003cli\u003eNoise of 2.0 bels at idle and 3.6 while working\u003c\/li\u003e\n\u003cli\u003eA 550TB yearly workload rating and 2.5 million hours MTBF\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe HC550 packs nine helium-sealed disks into one case. It was the first drive with energy-assisted recording and a triple-stage actuator.\u003c\/p\u003e\n\u003ch2\u003eFit and capacity\u003c\/h2\u003e\n\u003cp\u003eParts sellers list the R20GG for 13th, 14th, and 15th generation PowerEdge servers, such as the R730, R740, and R750, and for PowerVault shelves like the MD1400. Check Dell's drive list for your model first.\u003c\/p\u003e\n\u003cp\u003eThe drive is 3.5-inch and SAS. It needs a SAS backplane and a PERC or HBA card. Four drives in RAID 5 give about 54TB usable. Eight bays hold 144TB raw. Twelve bays hold 216TB raw, and RAID 6 leaves about 180TB usable. A full pass over 18TB at 269 MB\/s takes about 19 hours.\u003c\/p\u003e\n\u003ch2\u003eSector format and secure erase\u003c\/h2\u003e\n\u003cp\u003eThe 512e format shows 512-byte sectors to the host and keeps 4K sectors inside. Current PERC cards and operating systems handle that fine. Instant Secure Erase wipes the drive in seconds, so you can retire it without a long overwrite.\u003c\/p\u003e\n\u003ch2\u003eR20GG details\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eDell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePart number\u003c\/th\u003e\n\u003ctd\u003eR20GG (label: 0R20GG)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWD model\u003c\/th\u003e\n\u003ctd\u003eWUH721818AL5200 (cross-reference)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCapacity\u003c\/th\u003e\n\u003ctd\u003e18TB\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\"\u003eCache\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\"\u003eSecurity\u003c\/th\u003e\n\u003ctd\u003eISE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSustained transfer (WD)\u003c\/th\u003e\n\u003ctd\u003eUp to 269 MB\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePower, idle \/ active (WD)\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\"\u003eForm factor\u003c\/th\u003e\n\u003ctd\u003e3.5-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Dell","offers":[{"title":"Default Title","offer_id":62814083907955,"sku":"0R20GG","price":1490.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0992\/9546\/1747\/files\/R20GG.jpg?v=1778089434","url":"https:\/\/cpurepublic.com\/products\/dell-18tb-sas-hard-drive-r20gg","provider":"CPU Republic LLC","version":"1.0","type":"link"}