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My Mac-pro also made one of my USB storage devices inoperable.

I lost data in that USB device but another USB device and USB keyboard are fine. I have heard from my friend that this problem is usually triggered by having a second device plugged in after a first is already plugged in. This causes the second one to become unrecognizable.

I have only two USB ports and first I think port loose when I connect two USB devices. But later I found these hidden files (“.Spotlight-V100”, “.TemporaryItems”, “.Trashes”, and “._.Trashes”) are created by Mac OS. And before unrecognized that USB device I have deleted these files and my friend had also done the same action. Now I don’t want to test for next USB device to become unrecognized and I won’t deleted any hidden system file inside the flash drives. But I really want to know why these problems happened. Can I delete these hidden files when I only connect to virtual machine (Vista), because I used to delete all useless hidden files from USB flash drives?
Any suggestions or thoughts to prevent this or alternative suggestions to fix the problem that take lossless would be much appreciated.

Q. Why USB device to become unrecognized?

1.Because of deleting hidden files (“.Spotlight-V100”, “.TemporaryItems”, “.Trashes”, and “._.Trashes”) are created by Mac OS?

2.If I deleted any hidden system file inside the flash drives are created by Mac OS, would next USB storage devices be inoperable again?

Please answer this because my friend had also done the same.

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Sorry, I find it a bit hard to tell what happened. Maybe superuser.com/editing-help and a shorter question can help a bit? (Note that you need an empty line to create a new paragraph. And the first word should probably read "unfortunately", if it cannot be left out altogether?) – Arjan Apr 1 '10 at 10:18
this needs more information to be answerable; it is unclear what is being asked exactly. once it is edited to be clearer, flag for moderator attention and request it be reopened. – quack quixote Apr 26 '10 at 13:46
I agree this suffers a bit for clarity, but it does seem like the poster is asking (in not-their-first language) whether deleting some hidden files caused the issue, and if not, how can they prevent it happening again? For the record, I have deleted these files from my thumb drives without causing any trouble. – JRobert May 24 '10 at 14:13
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closed as not a real question by quack quixote Apr 26 '10 at 13:46

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. See the FAQ for guidance on how to improve it.