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Once the BIOS has found a bootable device it loads the boot sector to linear address 7C00h (usually segment:offset 0000h:7C00h,[1][2]: 29  but some BIOSes erroneously use 07C0h:0000h[citation needed]) and transfers execution to the boot code. In the case of a hard disk, this is referred to as the Master Boot Record (MBR). The conventional MBR code checks the MBR's partition table for a partition set as bootable[3] (the one with active flag set). If an active partition is found, the MBR code loads the boot sector code from that partition, known as Volume Boot Record (VBR), and executes it. The MBR boot code is often operating-system specific.