1 HDD,1SSD,1Optical DVD,SSd and optical are fuly useable,Drives are Sata conected,yes werifaied 2 times cabels are attached,SSd is listed in windows disk management the hdd no but in bios is listed.How many HDD's are in the computer? How many are actually useable? How are the drives connected? Have you verified both the data and power cables are properly attached? Are all of the drives listed in Windows Disk Management?
ok i removed the dvd drive then put the hdd in exact same sata location on motherboard were the dvd was,the power cable i let it the same,definitely the power cable and connector is ok,naw it works but is sata 2.0,when i change and connect on sata 3.0 connector on motherboard is making the same problem the hdd is visible in bios but not in windows,the motherboard is have 3 sata connectors 1 white-sata 2.0 1 black-sata 3.0 1 blue-sata6.0,what it will be the problem the sata connector is faulty or motherboard do not support 2 drives connected in sata 3.0 and 6.0 ore maybe i need to put the jumper on hdd,i think to replace the hdd with a ssd but i fear that i will have the same problem then .How many HDD's are in the computer? How many are actually useable? How are the drives connected? Have you verified both the data and power cables are properly attached? Are all of the drives listed in Windows Disk Management?
OptiPlex 790 (Desktop) https://downloads.dell.com/manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-790_owner's manual2_en-us.pdfJumpers aren't needed when using SATA connected drives. If there are 3 SATA connectors, then it should support drives. Ensure all of the SATA ports are enabled in the BIOS.
Which form factor is the PC? There appear to be four variations of the 790.
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