Attribute - Concept - NTFS Documentation
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# Concept - Attribute Id

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## Overview

Every Attribute in every FILE Record has an Attribute Id. This Id is unique within the FILE Record and is used to maintain data integrity.

link to file record a field of the FILE Record each attribute has an id reused when zero skipped

Next Attribute Id
  The Attribute Id that will be assigned to the next Attribute added to this MFT Record.
  N.B. Incremented each time it is used.
  N.B. Every time the MFT Record is reused this Id is set to zero.
  N.B. The first instance number is always 0.

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