Sorry for being so silent for a while; I was on vacation. I may not have 50 years of experience with PS, but I do have about 20 years of experience writing software for computers, from microcode to applications. I understand that hardware can fail and fail in strange ways, but Occam's Razor says the simplest solution is usually correct. It seems to me much more likely that there is a bug in PS than that no other application or diagnostic finds an error with any hardware, but PS does. I'm not saying it's impossible, but it doesn't seem the most likely.

Let me again recap the symptoms:

- If Photoshop is open for a long time, it refuses to save to the main HD, with the error "Could not save <filename> because of a disk error."
- It does not matter if the file in question has been open a long time or recently opened. - If I try to save to another drive, it works fine.
- No files are ever corrupted.

For those of you that insist it's a hardware problem, what should I do? If no diagnostic shows an issue, I can't get any warranty support, right? Are you suggesting that I should pay to start swaping components and see if this problem goes away? That's just too radical a solution. I'll certainly keep running diagnostics, but until I have proof, it's just much more believable that PS has a bug.

I'm not totally ingoring your advice. I'm super paranoid about losing data. All my unrecoverable data is backup up regularly (and even rotated off site weekly). I even store the MD5 hash of each file and check it weekly, so that I can detect bad sectors and other subtle failures. None of the files has even been found to be corrupted.

I've gotten part of what I wanted out of this exchange, which is that other people see the same thing. Since there's an easy work-around: save to the other disk then re-start PS, I guess I'll just ignore it for now. Re-installing the OS is no easier now that if the disk fails catastrophically, and since I don't believe that will get rid of the problem, I'll choose to make that investment only when it becomes clear that it is necessary.

If my hard drive does indeed fail soon, I'll be happy to eat crow here.

Andrew

PS to Tom Holland: I doubt that you'd be able to get Apple to believe it's a hardware problem, but if you do, please let me know.

Andrew_Certain

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