# System Deployment Image, a disk image format used by Microsoft — file signature 24 53 44 49 30 30 30 31 at offset 0

For System Deployment Image, a disk image format used by Microsoft, hex signature is 24 53 44 49 30 30 30 31; offset is 0, verified against its source on 2026-09-22.

- **Hex signature:** 24 53 44 49 30 30 30 31 _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Format:** System Deployment Image, a disk image format used by Microsoft _(verified: appears in the quote below)_

## What the source says

> 24 53 44 49 30 30 30 31 | $SDI0001 | 0 | | System Deployment Image, a disk image format used by Microsoft |

## Source

- https://en.wikipedia.org/wiki/List_of_file_signatures

Last verified: 2026-09-22. Review by: 2027-09-22.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).