Purple band suddenly appearing on layered TIFF files

[defaultyfk3qa3z1x64]

While working on a scanned photograph as a layered TIFF in Photoshop, a large purple band suddenly appeared on the file. Hiding/showing layers does nothing to remove it--only when I hide the Camera Raw Filter layer does it change, but the band just becomes larger. Is this a file corruption or something else? Incredibly frustrating as I've been working on this image for a while, and I can't find a way to remove it.

Using Photoshop 2024 in Sonoma 14.6.1.

[D Fosse]

That looks like file corruption, which is always caused by failing hardware.

Are you saving directly to an external drive, or over a network connection?

[defaultyfk3qa3z1x64]

Agh, bummer. I'm saving directly to an external drive. Perhaps I should work on the file locally?

Not the worst news, as I can copy over my layers to the original scan (unless there's any corruption connection there).

[Kevin Stohlmeyer]

@defaultyfk3qa3z1x64 too late in hindsight but its recommended to never save directly to an external source - drive, server, cloud service etc. Always save local and drag over to store. Sorry.

[D Fosse]

The big problem with external drives is connection stability. External drives get kicked around, and cables and connectors inevitably get worn and increasingly loose-fitting. It only takes a nanosecond broken connection to corrupt a file.

In addition you have an extra layer of USB drivers and protocols, making the save process much slower and vulnerable to random errors.

https://helpx.adobe.com/photoshop/kb/networks-removable-media-photoshop.html?x-product=Helpx%2F1.0.0... 

Generally, when using external drives, handle with care. Don't touch it while data transfer is in progress. Replace cables regularly.

[Lumigraphics]

Please post a system report. Help->System Info

[defaultyfk3qa3z1x64]

Ah well, you live and you learn. Appreciate the insight and help, all!