On older motherboards, 3TB drives often show limited capacity (typically 746GB or 801GB) due to legacy Master Boot Record (MBR) limitations, which cap storage at 2.2TB, and older storage drivers. Solutions include initializing the drive as GPT in Disk Management for data storage, utilizing drive manufacturer software like Seagate DiscWizard, or using a PCIe SATA expansion card. For more technical details on the 746GB issue, visit ServeTheHome. Solved: Legacy BIOS and 3TB hard drive – Experts Exchange
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