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Good — thanks for the screenshot. R: clearly contains a small recovery area (Recovery folder, System Volume Information, a small .CBM file). That tells us it’s a recovery partition, not user data. You have two safe choices:
1) Confirm Windows Recovery Environment (WinRE) location (important)
This tells us where the active WinRE is hosted — if it points to R: we should not delete R: unless we reconfigure WinRE first.
Run:
reagentc /info
2) (Recommended) Hide R: by removing its drive letter
This is reversible and keeps the recovery partition intact.
a) Find the partition that corresponds to R:
Get-Partition -DriveLetter R | Format-List *
b) Remove the access path (hide):
Remove-PartitionAccessPath -DiskNumber $part.DiskNumber -PartitionNumber $part.PartitionNumber -AccessPath "R:\"
After that, R: will disappear from File Explorer but the partition remains.
3) If you want to delete R: (only after full image + recovery USB)
Prerequisites (must do before deleting)
a) Confirm partition number:
Get-Partition -DriveLetter R | Format-List DiskNumber,PartitionNumber,Size
b) Delete partition (this permanently removes it):
select disk 0
select partition 4
delete partition override
exit
(Or in PowerShell)
$part = Get-Partition -DriveLetter R
Remove-Partition -DiskNumber $part.DiskNumber -PartitionNumber $part.PartitionNumber -Confirm:$false
c) Reclaim/extend C: (if unallocated space sits directly after C
Move WinRE to the EFI/System partition first (example — check your EFI drive letter; suppose it is S: — confirm first):
5) Quick safety checklist before doing anything destructive
- Hide it (recommended, safe, reversible) — simply remove the drive letter so it won’t show in Explorer. No data removed.
- Delete it (only if you have a disk image / recovery USB and are OK losing the OEM recovery) — frees the 700+ MB and lets you potentially expand C:.
1) Confirm Windows Recovery Environment (WinRE) location (important)
This tells us where the active WinRE is hosted — if it points to R: we should not delete R: unless we reconfigure WinRE first.
Run:
reagentc /info
- If "Windows RE location" shows a path on R: (for example R:\Recovery\WindowsRE\Winre.wim) then R: contains the active WinRE and you should not delete it until you move or disable WinRE.
- If it points to a different partition (or WinRE is Disabled), deletion is less risky (still backup first).
2) (Recommended) Hide R: by removing its drive letter
This is reversible and keeps the recovery partition intact.
a) Find the partition that corresponds to R:
Get-Partition -DriveLetter R | Format-List *
b) Remove the access path (hide):
Replace the partition number/ disk number if the above shows different values
$part = Get-Partition -DriveLetter RRemove-PartitionAccessPath -DiskNumber $part.DiskNumber -PartitionNumber $part.PartitionNumber -AccessPath "R:\"
After that, R: will disappear from File Explorer but the partition remains.
3) If you want to delete R: (only after full image + recovery USB)
Prerequisites (must do before deleting)
- Create a full disk image (Macrium Reflect or similar) OR ensure you have a full reinstall/recovery plan.
- Create a Windows recovery USB (Settings → Recovery → Create a recovery drive) or use Media Creation Tool to create install media.
- Confirm reagentc /info does NOT list WinRE on R: (if it does, use reagentc to relocate or disable WinRE first).
a) Confirm partition number:
Get-Partition -DriveLetter R | Format-List DiskNumber,PartitionNumber,Size
b) Delete partition (this permanently removes it):
Replace DiskNumber and PartitionNumber from the previous command
diskpartselect disk 0
select partition 4
delete partition override
exit
(Or in PowerShell)
$part = Get-Partition -DriveLetter R
Remove-Partition -DiskNumber $part.DiskNumber -PartitionNumber $part.PartitionNumber -Confirm:$false
c) Reclaim/extend C: (if unallocated space sits directly after C
- If Disk Management shows unallocated space immediately to the right of C:, you can right‑click C: → Extend Volume.
- In PowerShell (replace NewSize with desired final size in bytes — easier via Disk Management):
Resize-Partition -DriveLetter C -Size ((Get-PartitionSupportedSize -DriveLetter C).SizeMax)
- Windows Disk Management cannot extend C: across those; you’ll need a third‑party partitioning tool (MiniTool / AOMEI / GParted) to move partitions. Do that only from a full disk image backup.
Move WinRE to the EFI/System partition first (example — check your EFI drive letter; suppose it is S: — confirm first):
- Mount EFI/System partition if not lettered (assign a temp letter S):
$efi = Get-Partition -Type System
Add-PartitionAccessPath -DiskNumber $efi.DiskNumber -PartitionNumber $efi.PartitionNumber -AccessPath "S:\" - Copy WinRE and update reagentc:
mkdir S:\Recovery\WindowsRE
robocopy R:\Recovery\WindowsRE S:\Recovery\WindowsRE /E
reagentc /setreimage /path S:\Recovery\WindowsRE
reagentc /enable
Verify
reagentc /info
5) Quick safety checklist before doing anything destructive
- Backup: full disk image or at least your user data externally.
- Recovery media: create a Windows USB recovery/install drive.
- Verify reagentc /info and that you can boot from recovery media.
- If in doubt, choose “hide” (remove drive letter) — reversible and safe.
- “Hide R:” — I’ll give the one‑line to remove the drive letter and we’ll stop.
- “Delete R: (I made backups)” — I’ll give the exact diskpart commands (I’ll wait while you confirm reagentc output and that you have a recovery USB).
- “Move WinRE from R: to EFI then delete” — I’ll walk through the safe copy + reagentc steps.