The Tier window

The Tier window is the main day-to-day surface. It's a two-pane file browser sized to feel like Finder, with extras that only make sense when you're working with paired drives.

Layout

• Left pane: internal SSD side of the active pair.
• Right pane: external NVMe side of the active pair.
• Middle column: action arrows — Move (→ / ←), Merge (with

conflict policy), and Relocate (move + symlink).

Mirror-hover

When a pair is active, hovering or selecting an item in either pane auto-scrolls the other pane to the matching relative path. This lets you "see both sides" of any file without breaking your focus.

Side-specific Home

Each pane has its own Home button that returns to the pair root. A center Home both button does both at once. When unpaired, Home goes to your user folder.

Pair-relative paths

Drilling into a subfolder is "pair-relative" — the destination side mirrors your depth automatically. A move from ~/Documents/Work/Q3/Renders lands at /Volumes/Tank/Documents/Work/Q3/Renders, not at the pair root.

Actions

• Move — physical move + delete source. Confirms if the

destination exists.

• Merge — copy files into an existing destination folder. The

policy sheet asks Merge (default) vs. Override.

• Relocate — move the file then drop a symlink at the source.

Apps and scripts that reference the old path keep working.

Symlink-loop detection prevents the app from rsyncing a file onto its own symlink target.