# Why does an MBR partition table entry have its starting sector as both CHS and LBA

mbrpartitioning

In an MBR's partition table section, every partition has the first absolute sector available in both the CHS and LBA formats. It's relatively straightforward to convert between the two.

When the MBR was originally created, I imagine bits were at a premium.

Does having the sector in both formats for machine consumption have any value?