# Sysbase

Sysbase refers to the first frame where data is stored on the disk.

The D3 Filesystem begins at FID 1. The following frames contain system information, the lock
 tables, the D3 Boot ABS, and PIB process control blocks.

 The sysbase is the address of the system dictionary, or mds.

 The what command outputs the sysbase FID.

## See also

- [Boot error codes](https://d3codex.com/unix/boot-error-codes/)
- [FID](https://d3codex.com/definitions/fid/)
- [what command](https://d3codex.com/tcl/what-command/)

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Source: https://d3codex.com/definitions/sysbase/ - part of the D3Codex reference.