What is the maximum bootable storage capacity supported by BIOS mode?

The maximum bootable storage capacity supported by BIOS mode is indeed 2 TB. This is due to the limitation of the Master Boot Record (MBR) partitioning scheme, which is used in BIOS systems. MBR allows for a maximum of four primary partitions and can recognize disk sizes up to 2 TB (specifically 2^32 sectors of 512 bytes each).

When BIOS-mode booting is in use, the system cannot recognize or boot from a drive that exceeds this 2 TB limit. This limitation arises from the way data is structured in MBR; the addressing scheme simply cannot handle larger sizes. While GPT (GUID Partition Table) allows for much larger bootable drives and is utilized in UEFI systems, BIOS does not support GPT in the traditional sense.

This is why in scenarios involving traditional BIOS-mode booting, any storage capacity over 2 TB wouldn't be bootable, affirming that the correct answer regarding the maximum bootable storage capacity under these circumstances is 2 TB.