Custom folder icons won't stick on an external drive
If your Mac keeps dropping the custom icon on folders stored on an external drive, that drive is almost certainly exFAT or FAT32. macOS stores a folder icon as metadata — an icns resource on a hidden Icon file — that those Windows-compatible formats don't hold natively. Reformat to APFS, or accept generic folders.
Two notes first. If it's the drive's own icon showing the Adobe Creative Cloud logo, that's an extension, not a file system. And no app can work around the format problem — this one included.
Start with the drive's format — the answer is right there
The work drive you plug in at your desk is the usual suspect, and one line settles it: select it in the Finder sidebar, press Command-I and read the Format line.
If it says ExFAT or MS-DOS (FAT), stop hunting for a Finder setting — there isn't one. Disk Utility only offers APFS, Mac OS Extended, MS-DOS (FAT) and ExFAT; Apple files the last two as Windows-compatible and describes them by capacity alone: FAT for volumes of 32 GB or less, ExFAT for anything larger. Icons are never mentioned there.
Two triage questions. Is it the drive's icon that's wrong, or the folders inside it? If only the drive looks wrong, jump to the Creative Cloud section. And if the same thing happens on your internal disk, the format isn't involved: see folder icon not changing on an internal drive.
What macOS actually writes when you paste a folder icon
Paste an image onto a folder and macOS doesn't modify the folder: it creates a hidden file inside it, named Icon followed by a carriage return — the one the Finder shows as Icon?.
The artwork lives in an extended attribute on that file, com.apple.ResourceFork, as an icns resource with the ID −16455. The other half is a flag: per Apple's legacy Finder documentation, the Finder sets the hasCustomIcon bit in the folder's com.apple.FinderInfo, and without it the Finder never looks for the Icon? file.
The part every other page gets wrong: a zero-byte Icon? file proves nothing. It has no data at all, by design, on APFS exactly as on exFAT — the image sits in the attribute. The symptom isn't “the file is empty”, it's “the file is there and the folder is still generic”.
A folder icon is never file content: two pieces of metadata, one on a child file, one on the folder — so the volume decides. Procedure: how to change a folder icon on Mac.
Why exFAT and FAT32 lose it, and why NTFS never gets a chance
FAT32 and exFAT have no native extended attributes. macOS emulates them with an AppleDouble sidecar beside each item — a hidden file prefixed with ._ — holding the attribute content. So they carry Mac metadata indirectly, with a ceiling of about 128 KiB. Windows shows those files as clutter, and people delete them.
The honest version is narrower than “impossible”: pasting an icon does not reliably produce a folder icon on FAT32 or exFAT, and the behaviour shifts between macOS releases. Apple never promised otherwise.
NTFS never reaches the starting line: macOS reads it but can't write to it, and Disk Utility won't format a volume that way.
| Format | Writable from macOS | Folder icons | Readable on Windows |
|---|---|---|---|
| APFS | Yes | Yes | No, not natively |
| Mac OS Extended | Yes | Yes | No, not natively |
| ExFAT | Yes | Not reliably | Yes |
| MS-DOS (FAT) | Yes | Not reliably | Yes |
| NTFS | Read-only | No | Yes |
Four versions of macOS, four waves of reports
Not one bad release: the same complaint across four generations of macOS.
- Ventura, 12 November 2022. Apple Community, “No more custom folder icons on FAT32 and exFAT”: the Get Info drag stops working on FAT32 and exFAT sticks, an
Icon?file appears, APFS unaffected. - Sonoma, 2 December 2023. “Can't set folder icons for the folders in external drives”: a zero-byte
Icon?file, the default icon stays, on exFAT and FAT32, fixed only by reformatting to APFS. The clearest reply: “In Sonoma the custom icon uses the Resource fork to store the image data. There are no resource forks on any FAT file system.” - A remission, 2 February 2024. Same thread: a user reports it working again on Sonoma 14.3, confirmed by a second. “It never worked” is as wrong as “it works”.
- Tahoe, 17 January 2026. A MacRumors thread gives the macOS 26 signature: icons on an exFAT drive appear briefly in a freshly opened Finder window, then snap back the instant you select an item or change the view — the same files on the internal disk are fine.
One contributor there reports success after disabling .DS_Store writing on USB volumes — undocumented by Apple, and at odds with the mechanism: that setting also suppresses the ._ sidecars.
No app can add a resource fork to exFAT
The reference tool for icons on macOS, fileicon, says so in its README: “Custom icons rely on extended attributes of macOS filesystems, HFS+ and APFS… custom icons are lost when copying files or folders to filesystems that don't support these attributes.” It writes exactly what the Finder writes: the hidden Icon? file, the flag in com.apple.FinderInfo.
Every app goes through those same APIs. Icon packs, folder utilities, Mac+ included: none can add a resource fork to an exFAT volume — that's the file system's doing, not the software's.
Aliases look like the same bug and aren't. A custom icon on an alias to a folder on an external drive goes generic whenever the drive isn't mounted or unlocked. And since macOS Sonoma 14.6 the Finder no longer saves a custom icon onto an alias at all: Apple support said in August 2024 that there was no solution and no plan to fix it. Workaround: drag the icon from the preview onto the thumbnail in the alias's Get Info window.
Two symptoms that have nothing to do with the format
The Creative Cloud logo on your drives. If the icons of all your external disks turned into the Adobe Creative Cloud logo on their own, usually right after a Creative Cloud update, the format isn't involved. Adobe registers itself as a macOS File Provider extension — a mechanism meant for cloud storage that also claims external drives.
The fix, confirmed on macOS 26.3: System Settings > General > Login Items & Extensions, the Extensions section in By Category view, click the i next to File Providers, then turn off Core Sync and Creative Cloud. You lose Creative Cloud syncing, its status badges and Adobe's menu entries; the setting is reported to come back after Adobe updates.
The triage signal: Adobe changes the icon of the drive, never those of the folders inside it — and it happens without you doing anything.
What actually works: reformat, disk image, or the drive's own icon
Three routes, by increasing cost.
a) Erase and reformat to APFS (or Mac OS Extended on an older Mac). The only reliable answer — but the drive is erased, so back it up first, and Windows won't read it natively.
b) Keep exFAT and put a disk image on it. Create an APFS or Mac OS Extended disk image on the volume and keep the folders in it: attributes survive, icons hold, and the drive stays Windows-readable. Only Macs open the image; the idea comes from that MacRumors thread.
c) Keep exFAT and customise the drive icon only. A volume icon works differently: a real .VolumeIcon.icns file at the root — file content, not metadata. Success reports exist on FAT32 where folders have none: one user pasted an image exported as .icns from Preview into the drive's Get Info window; it survived an eject and remount. The .icns export matters — a dragged PNG isn't the same — and volume icons are reported to fail often since macOS 13.1: reports of success, not a guarantee. Lands but looks soft? That's a blurry custom folder icon, another problem.
One unconfirmed lead. Tahoe's colour, symbol and emoji customisation writes a plain com.apple.icon.folder attribute on the folder, not a resource fork on a child file — a different failure profile, worth trying before you erase anything, though no public test confirms it on exFAT.
Where Mac+ fits, honestly. Mac+ writes the same attributes the Finder does: on exFAT or FAT32 it cannot make a folder icon stick either. Its value comes after the reformat: re-applying forty icons one Get Info window at a time is the painful part. Mac+ does a whole selection at once, on the real macOS folder shape — 52 motifs, 44 palettes, or your own image fitted to it — six icons in the free tier. See Mac folder icons.
Diagnose it in five steps
- Select the external drive in the Finder sidebar, choose File > Get Info, and read the Format line. “ExFAT” or “MS-DOS (FAT)” is your answer. Disk Utility shows the same information.
- Open the folder that lost its icon and show hidden files — the Finder has a keyboard shortcut for it with no menu equivalent, or run ls -a in Terminal. A file named Icon followed by an invisible character means macOS did write the container: it's the reading back that fails, not your image.
- Copy that same folder to your internal disk and paste an icon onto the copy. If it holds inside and not outside, the format is the cause — not the image, not permissions, not your macOS version.
- If it's only the drive's icon that's wrong and it looks like the Creative Cloud logo: System Settings > General > Login Items & Extensions > Extensions, By Category view, click the i next to File Providers, and turn off Core Sync and Creative Cloud.
- Decide: erase and reformat to APFS, put an APFS disk image on the exFAT drive, or customise only the drive icon with an .icns file. Back up before any formatting.
macOS 13 or later. Apple Silicon and Intel. Six folder icons in the free tier, no account required. Folder icons need an APFS or Mac OS Extended volume.
Frequently asked questions
Why do custom folder icons disappear on my external hard drive?
Nine times out of ten because the drive is formatted exFAT or FAT32. A folder icon isn't stored in the folder — it's an icns resource in an extended attribute on a hidden Icon file, plus a flag in another attribute on the folder itself. Those Windows-compatible formats have no native support for extended attributes, so macOS falls back to hidden ._ sidecar files and the result is unreliable.
Do custom folder icons work on an exFAT drive on a Mac?
Not dependably. Users have reported the failure on Ventura in November 2022, on Sonoma in December 2023, and again on macOS 26 Tahoe in January 2026, with at least one documented remission in Sonoma 14.3. So it isn't “it never worked” and it isn't “it works” — it's a behaviour Apple has never guaranteed on FAT file systems, and it changes from release to release.
What is the Icon? file that appears inside my folder?
It's the container macOS creates for a custom folder icon: a hidden file named Icon followed by a carriage return. It holds no data at all, by design — the artwork lives in an extended attribute on it, so a size of zero bytes is normal, on APFS as much as on exFAT. Don't delete it if your icon is working; deleting it removes the icon.
How do I change the icon of an external drive on a Mac?
A drive icon works differently from a folder icon: it relies on a real .VolumeIcon.icns file at the root of the volume, which is file content rather than metadata. Export your image as .icns in Preview, copy it, then select the drive, open Get Info and paste onto the thumbnail at the top of the window. It's the only customisation with reports of success on FAT32 and exFAT — though volume icons have also been reported to fail often since macOS 13.1.
Why did my external drive icons turn into the Adobe Creative Cloud logo?
Because Adobe registers Core Sync and Creative Cloud as macOS File Provider extensions, and that mechanism, designed for cloud storage, also claims external drives. Go to System Settings > General > Login Items & Extensions, find the Extensions section in By Category view, click the i next to File Providers, and switch off Core Sync and Creative Cloud. You lose Creative Cloud file syncing and its status badges, and the setting may come back after an Adobe update.
Will reformatting to APFS stop Windows from reading my drive?
Yes, natively. Windows doesn't read APFS or Mac OS Extended without third-party software, which is the real trade-off of this page: reliable folder icons, or a disk that any PC can open. If you need both, keep the drive exFAT and store the folders inside an APFS disk image placed on it — the drive stays readable on Windows, and the image opens on Macs only.
Keep reading
Sources
- Apple Community — No more custom folder icons on FAT32 and exFAT
- Apple Community — Can't set folder icons for the folders in external drives
- The Eclectic Light Company — Custom Finder icons, resources and Mac OS history
- The Eclectic Light Company — Which file systems and Cloud services preserve extended attributes?
- Apple Community — Why do the icons for all my external disks display as Adobe Creative Cloud?