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Moving /home to a dedicated drive can make Linux reinstalls easier: the operating system can be reinstalled while the separate home filesystem remains intact, provided the installer mounts it at /home and does not format it. It is not a substitute for a backup, and reusing every application setting across different distributions can cause compatibility problems.
What moving /home changes
Linux stores user files and settings under /home. Putting that directory on its own filesystem—either a separate partition or a dedicated physical drive—lets you manage the operating system’s root filesystem separately. The home drive can hold documents and other user data while the root filesystem is reinstalled or repartitioned.
With a dedicated drive, the system mounts that filesystem at /home. The directory path stays the same for applications and users; the storage behind it changes. This setup requires choosing how much space to allocate to each filesystem, and separating storage does not itself protect data from drive failure or mistakes.
Choose how to use the separate drive
Separate partition on the system drive
A separate partition creates a boundary between the root filesystem and home data on the same physical disk. It can simplify managing root independently, but the space allocation is constrained by that disk’s partition layout.
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Dedicated physical drive
A second drive keeps home data on separate hardware from the system drive. It is still a single device, so it can fail; maintain an independent backup before making changes.
For frequent distribution changes, separate home directories may be safer
A persistent home filesystem can preserve personal files through reinstalls, but a shared, continuously reused home directory is not automatically compatible across unrelated distributions. ArchWiki warns that distributions may ship different software versions and patches, which can make application configuration incompatible. Consider keeping separate home directories for each distribution and using a shared location for documents and media instead. ArchWiki’s partitioning guidance discusses the trade-offs.
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Prepare before copying
- Make an independent backup of important files. A separate home drive is not a backup.
- Prepare a filesystem on the destination drive. Ubuntu’s community migration guide gives Linux filesystem examples, but check the filesystem support and requirements for the distribution you use rather than treating those examples as universal. Ubuntu’s home-migration guide
- Plan to copy while logged out, with applications closed where feasible. Files changing during a live copy can be missed or captured in an inconsistent state. ArchWiki’s rsync guidance
- Keep the original home data until the new mount has been tested and you have confirmed that files and logins work.
Copy the existing home data
The exact commands depend on your source and destination paths, filesystem, and metadata needs. Ubuntu’s migration guide uses rsync as part of a staged move and recommends retaining the original copy temporarily. Do not assume that rsync -a preserves every metadata category: archive mode does not include ACLs or extended attributes. ArchWiki describes adding -A and -X when those are needed; whether to use them depends on the filesystems and data involved.
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First mount the destination filesystem at a temporary location, not at /home, and confirm it is the intended filesystem. Then copy the contents of the current home directory and check the copied files before changing the persistent mount configuration. The Ubuntu guide outlines this sequence; its screens and instructions may vary by distribution and release.
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Configure a persistent /home mount
Add the destination filesystem to /etc/fstab so it mounts at /home. Use a stable filesystem identifier such as a UUID rather than assuming a device name like /dev/sdb1 will always refer to the same drive. Device names can vary as disks are detected. The Ubuntu Noble fstab(5) manual documents UUID and label identifiers. Ubuntu’s mount-point guide also recommends UUIDs over device paths and cautions that removable external drives are often better handled through desktop auto-mounting than a boot-critical fstab entry.
- Find the destination filesystem’s UUID with a tool such as
blkid, and verify that it belongs to the drive you intend to use. - Back up
/etc/fstabbefore editing it. - Set the filesystem’s mount point to
/home, using the correct UUID and filesystem type. Make sure the mount-point directory exists. - Validate the edited configuration and test the mount before relying on it at boot. Follow the commands and recovery guidance for your distribution; a faulty mount entry can affect startup or login.
- Confirm that
/homeis mounted from the intended filesystem and that your files are present. Reboot or remount as appropriate for your system, then check that you can log in and access your data.
Do not delete the original home copy until those checks succeed. A separate filesystem may preserve data during a root reinstall only if the installer assigns it to /home and leaves its format option disabled. Ubuntu’s community guide also advises matching the existing username; installer screens and options vary, so confirm the choices presented by your distribution before proceeding.
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What a separate home drive does—and does not—preserve
It can keep files on the home filesystem while the operating system is replaced. It does not make application settings portable between distributions, guarantee that every installer will handle the filesystem identically, or protect against loss of the drive. Before reinstalling, verify the selected filesystem, its /home mount point, and the installer’s format setting. Keep a separate backup throughout the move and any repartitioning.
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