I can't see two of my internal drives on my mac pro?

I can't see two of my internal drives on my mac pro?  Any idea's or suggestions on how I can see them again.  They were working last week just fine - Now they don't even show up in the finder? I have video stored on one and the other is just used for extra storage if needed - not really used much.

A drive that will not show BOTH its Make&Model AND a reasonable Size/capacity in Disk Utility has failed.
IF Disk Utility can see those things, use (Repair Disk) to attempt to repair its Directory. It takes about five minutes. If it finishes in 10 seconds, it just repaired the Partition Map and nothing else. Select the Macintosh_HD or whatever you renamed the Volume, and (Repair Disk) again.

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