Claude Code storage incident

Claude Code Windows ENOSPC Write Error

If Claude Code on Windows logs ENOSPC: no space left on device, write, do not start by deleting session history or project files. First prove which filesystem is full: the Windows profile drive, Bun root, temp folder, Claude state, or a mounted workspace path such as B:\~BUN.

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Read-Only Evidence

Claude Code can surface storage errors from several places on Windows. The fastest safe triage is to measure each likely location without printing file contents.

PowerShell first pass

Measure drives, temp, Claude state, and Bun root.

This reads sizes and paths only. It does not upload files, read prompts, or delete anything.

Get-PSDrive -PSProvider FileSystem | Sort-Object Free | Format-Table Name,Root,Used,Free

$paths = @(
  $env:TEMP,
  $env:TMP,
  "$env:USERPROFILE\.claude",
  "$env:APPDATA\Claude",
  "$env:LOCALAPPDATA\Claude",
  "B:\~BUN"
) | Select-Object -Unique

foreach ($path in $paths) {
  if (Test-Path -LiteralPath $path) {
    $stats = Get-ChildItem -LiteralPath $path -Force -Recurse -ErrorAction SilentlyContinue |
      Measure-Object -Property Length -Sum
    [pscustomobject]@{
      Path = $path
      Files = $stats.Count
      GB = [math]::Round(($stats.Sum / 1GB), 2)
    }
  }
}

Get-ChildItem -LiteralPath $env:TEMP -Force -Recurse -ErrorAction SilentlyContinue |
  Sort-Object Length -Descending |
  Select-Object -First 40 FullName,@{Name='MB';Expression={[math]::Round($_.Length/1MB,1)}},LastWriteTime

What The Output Means

Profile drive full: Downloads, caches, package stores, and app data may be the real blocker before Claude state is involved.
Temp folder full: stale installers, extracted bundles, crash dumps, or agent scratch files can block new writes.
Claude state large: session history, logs, and tool output need review before deletion because they may be the only recovery trail.
Bun root or mounted drive full: the failing path can be outside C:, so drive-level checks must include the path shown in the error.

Do Not Delete First

Do not delete active Claude session directories, transcripts, or project state until you know whether recovery is needed.
Do not clear every temp folder while Claude or build tools are still running.
Do not remove package caches that your current project needs until you know whether they are rebuildable.
Do not paste secrets, private file contents, or full transcripts into a public issue.

Deep Cleanup

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