Kosh shows each internal and external drive's space, health and measured speed, says plainly whether it suits editing, recording or archiving, and lists what is on it, even after you unplug it.
A practical setup
See each drive's space, health and measured speed, what it is good for, and what is on it, then clear REAPER backups and clutter to the Trash safely.
Plug in the drive and open Kosh from the menu bar. It reads the file list gently in the background.
Run Test speed, then read the verdict for 4K editing, recording and archiving, and the health card.
Open What's on it or Clean up to see projects, backups and duplicates; anything you remove goes to the Trash with Put back.
Before you begin
Free for Apple-silicon Macs on macOS 14 or later, tested on one studio Mac so far. Many USB enclosures hide a drive's own health data; Kosh says when it cannot tell.
See every drive's space, health and speed, find REAPER projects, duplicates and photos, and clear backup files to the Trash safely. Free for Mac.
Each drive gets a plain verdict for 4K editing, recording, sample libraries, backups and long-term archive, based on how it is connected and on a speed test you can run. Health comes from the drive's own self-test, macOS error counts and Kosh's optional read check.
See iCloud Drive, Dropbox, Google Drive and OneDrive folders, Photos and Final Cut libraries, documents by type (PDFs, scores, Word, spreadsheets) and the biggest folders and files. Click any of them to look inside.
Kosh reads REAPER projects to list missing files, recordings no project uses and the .rpp-bak backup files that pile up. Final Cut, Logic, Pro Tools and other projects are listed too.
Backups, render files and clutter go to the Trash, never straight to deletion, and History puts them back. REAPER backups are grouped by folder and project: Kosh keeps the newest few of every project, any backup saved after its project, and the last backup of a project whose .RPP is missing. While REAPER or Final Cut is open, their recent files are left alone.
While Kosh is open it follows every drive it knows, so a file moved, deleted or added shows within seconds, with a short list of what just changed. A drive is noticed the moment it is plugged in.
Put in a card from the photographer or videographer, through a reader or a hub, and Kosh sorts it by camera, day and kind — photos, RAW, video and audio — sets aside test clips under five seconds, tells an SD card from a microSD, and shows how fast it reads. Copy it to one or two drives under the shoot's name; every file is read back and checked before Kosh says it is safe to format. Kosh only reads cards and remembers which ones it has copied.
Kosh calls two files duplicates only after reading every byte of both. Copies a Final Cut library links to, copies in Final Cut or project folders, and audio a REAPER session uses get their own list and stay where they are, so no project loses its media. Only the loose extras are offered for the Trash.
Kosh remembers each scanned drive's file list on your Mac, so you can find a project and see which drive it is on before you go looking for the drive.
A small panel shows every drive, warns when one is nearly full or failing, and ejects drives safely. Pop it out to keep it on screen. New drives are scanned gently in the background.
Kosh is a free app for Apple-silicon Macs on macOS 14 or later. It was built and tested on one M4 Pro Mac mini running macOS 15.6.1 with USB hard disks and SSDs; other Macs and drive enclosures have not been tested yet. Health readings depend on what each drive reports: many USB enclosures hide their self-test data, so Kosh says when it cannot tell. Photo ranking needs macOS 15. Copies of Kosh check for signed updates and ask before installing.
Our studio fills drives with lessons, REAPER sessions and Final Cut libraries. I wanted to know, at a glance, which drive is safe to work from, which belongs on the shelf, and where a project actually lives. — Jason Zac
Release notes and early build calls for this product.
No. Everything you choose goes to the Trash, and History can put it back until you empty the Trash yourself. Kosh never empties the Trash.
No. Final Cut and REAPER find media by its exact place on the drive, so Kosh never offers a copy that a Final Cut library links to, that sits in a Final Cut or project folder, or that a REAPER project names. Those sets are listed separately under “Used by Final Cut & projects”.
No. Kosh only reads cards: it never writes a test file, renames, moves or deletes anything on one, and never formats it. Format the card in the camera once Kosh says the copy is checked.
No. Scans, results and history stay on your Mac. The only network use is checking GitHub for a signed Kosh update. There are no analytics.
Automatic scans read only file names and sizes, one drive at a time, at low disk priority. Speed tests and full read checks run only when you start them, and Kosh asks first while REAPER or Final Cut is open.
Kosh checks for a new signed version every few hours and shows it in the sidebar and menu-bar panel. Nothing installs until you choose Update. You can switch automatic checks off in Settings.
An Apple-silicon Mac on macOS 14 or later. Open the download, drag Kosh to Applications and open it. It is signed and notarized by Apple.
Play supported video and audio, study MIDI and scores, open interactive HTML files, create practice loops, and prepare an OBS scene for teaching.
Save permitted video or audio, choose stills, clips and GIFs, and make practice copies with on-device transcripts in one Mac app.