---
type: "term"
title: "Loss of Availability (LoA)"
description: "A Data Risk Event outcome where data or resources are gone or unreachable — the resource no longer exists or cannot be technically accessed by the infrastructure."
resource: "tlctc:term:loss-of-availability-loa"
tags:
  - "glossary"
---
# Loss of Availability (LoA)

A Data Risk Event outcome where data or resources are gone or unreachable — the resource no longer exists or cannot be technically accessed by the infrastructure. From the attacker's perspective: "Data gone / system down". Examples: deletion, storage failure, system offline, network unreachable. DRE notation: `Av` (refined) or `A` (general). Not to be confused with Loss of Accessibility (data present but unusable, e.g., ransomware encryption → `Ac`).
