One Shared NTFS Partition for Windows and Ubuntu Files

Build the shelf from Windows, where NTFS is native. Any free space will do — shrink an existing data partition, or use space left over from the dual boot setup.

1. Open Disk Management with diskmgmt.msc
2. Right-click the unallocated space and choose New Simple Volume
3. Format it as NTFS and give it a clear label like Data or Shared
4. Assign it a drive letter in Windows as usual

If the space does not exist yet, shrink your Windows data partition first — the same Shrink Volume tool from the checklist guide. The Ubuntu system partition itself is never the shared space; Ubuntu's own files stay on its own file system.

Everything about this shared drive works only while Windows shuts down completely. With Fast Startup on, Windows hibernates its session and keeps every NTFS drive — including this shared one — in a locked state.

1. Ubuntu then mounts the shared drive read only, or refuses it
2. Files you saved in Ubuntu can also confuse a hibernated Windows when it resumes
3. The fix is the single Control Panel setting from the Fast Startup guide in this series

This is the step people skip and then blame the partition for. Shared drive plus Fast Startup is a combination that cannot work — pick the shared drive and turn Fast Startup off for good.

The shared partition already appears in Ubuntu's Files app — click it and it mounts. To have it ready at every boot without clicking, set it once in the Disks app or with one line in the mounts file.

1. Open Disks, select the shared partition, and open Edit Mount Options under the gear icon
2. Turn on Mount at system startup and pick a mount point like /data
3. Or add a line to /etc/fstab using the partition's UUID, shown by sudo blkid
4. Test with sudo mount -a before rebooting, so a typing mistake is caught while you can still fix it

The fstab line below is the classic shape. NTFS partitions identify themselves with a short hex UUID — always copy yours from blkid, never reuse the example.

NTFS is a Windows file system, and Linux lives with a few of its rules rather than its own. Knowing them prevents confusing moments later.

1. No Linux permissions — the fine-grained owner and permission system does not exist on NTFS, so everything takes the mount options' settings
2. Executable bits are not stored — Linux programs and scripts kept here may lose their run permission; keep Linux software on Ubuntu's own partition
3. Case sensitivity differs — two files named Notes and notes are one file here, two files on Ubuntu's system
4. Never put Ubuntu's home folder or system files on it — it is a shelf for documents, media and downloads, not a foundation

Within those limits it is genuinely excellent at its one job: the same photo, PDF or project file, openable from whichever system you booted today.