Not seeing hard drive

I have 3 hard drives in my mac pro, all internal, which have been fine up until a week ago, now for some reason Drive 3 seems to not show up sometimes.
I see it on the desktop, but then if i go to open a file from it, say an mp3, it doesnt load it. It says the file is 0 bytes.
Other times the drive simply isnt showing up at all.
I have to restart the mac and its ok then.
Anyone have any ideas or help on this problem?
Thanks

you need to off load files, you need to erase (zero or 3-way) or look for scanning the entire drive, not just user volume, for bad sectors.
So having a solid system drive, and backup, and not lose files.
new drive? warranty or another issue. I didn't see you say this new drive you just added and what make/model etc and focus on that problem.

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