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# Attribute - $DATA (0x80)

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## Overview

This Attribute contains the file's data. A file's size is the size of its unnamed Data Stream.

As defined in $AttrDef, this attribute has a no minimum or maximum size.

## Layout of the Attribute (Resident)

Offset | Size | Description
--- | --- | ---
~ | ~ | Standard Attribute Header
0x00 |  | Any data

## Layout of the Attribute (Non-Resident)

## Notes

### Common Data Stream Used By Windows

- [Unnamed]
- {4c8cc155-6c1e-11d1-8e41-00c04fb9386d}
- ^EDocumentSummaryInformation
- ^ESebiesnrMkudrfcoIaamtykdDa
- ^ESummaryInformation
- $MountMgrDatabase
- $Bad
- $SDS
- $J
- $Max

### Other Information

Usually, a directory has no Data Attribute, and the Data Attribute of a file has no name.

        must have (at least empty) unnamed data attr

NTFS has an advantage: as you can have several data attributes for a file, you can easily implement HFS whose files are made of two parts (also called forks in the HFS terminology): a resource part and a data part. For the data part, you use default unnamed data attribute, and for the resource part, you use a data attribute named e.g. 'resource'.

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