Help hdd WD30EFRX

hello i recently bought myself a WD30EFRX  but when i check diskmanager it said there is only 750 gb but it should be 3tb i formated it fast and normal searched al around the internet but i cant fix it is it broken or fixable?

hope to hear something soon

Hi aapmens,

Usually that will happen if the system doesn’t support the capacity of the drive. Are you sure that your system can support a 3TB drive? Also, when you initialized/formatted the drive, did you set it to MBR or GPT? For drives over 2TB, you need to use a GPT partition table. Another possibility is the operation system that you are using. For larger drives like this you will most likely need a 64-bit operating system that is Windows 7 or higher.

i already have a 3tb disk who works fine. but what did work was setting raid to ahci in bios i was able to see my 2tb but i think i  did something stupid by not disconecting my 2raid hdd who i believe where set at raid 0 before changing to ahci did i lose that data :(?