A Lokal disk B er typisk det andet interne lagerdrev i en computer. It is usually a hard disk drive (HDD), but on newer computers, and laptops and other devices can also be a solid state drive (SSD) or a network-attached storage (NAS) drive.

Lokal disk B tildeles typisk af operativsystemet, efter at det har scannet alle de lagerdrev, der er tilsluttet computeren. Once it is assigned, it is usually given the drive letter "B" and can be used to store files, programs, and data just like any other internal storage drive.

When a Local Disk B is connected to the computer, the operating system detects the hardware, scans its partitions and file system, and assigns the "B" drive letter for easy access. Det kan derefter ses, tilgås og administreres på samme måde som andre lagerdrev.