Can't see added internal or external drives?

I have an XPS-8500, Windows 7 / 64bit with a 2TB internal plus 30GB SSD. I have had some signs of the internal hard drive having problems. I have tried to add additional drives, ( internal Seagate 500gb, external WD My Book 3TB ) to do backup up can't get the computer to see either of these. Device manager see's them but can't get a drive letter assigned. Device manager also reports "Other Devices" "unknown device".   With this combo, ( internal plus ssd ), does that mean I cannot add any other drives. I was told on another forum that the drives are only seen on port 0 & 1?? I have tried tools like DISKPART and Disk Manager to format and use the New Volume Wizard but they always time out with an error:
"The operation failed to complete because the Disk Management console view is not up-to-date"
Any help would be appreciated.
My Bios says RAID
Sata0/Port0       Main drive ( c: )
Sata1/Port5        DVD Samsung 224
Sata2/Port2        My New Drive, 500 gb seagate
Sata3/Port3        DVD Samsung 203b
MSata1/Port1     Samsung SSD 32G

Thanks for all the suggestions, I learned a lot of stuff between various forums but in the end I simply bite the bullet and did a system recovery using the disks I made upon purchase of the machine a few years back. I felt I could not get around that I had some OS system files that were corrupted ( says the output of scannow ). The main hardrive was failing and getting worse on each use. I did not have a system repair disk ..... and the list goes on and on.
After the restore, I reloaded all my software, downloaded hundreds of MS Updates. Had to re-configure the bios and set the ssd for raid and caching with the new drive accelerated. The new drive is only 500gb versus the oem 2 TB, but I'll pick up something else soon. The WD 3TB discovers. I have it partitioned into 2, 1.5 TB partitions.
Everything is functioning fine. I created a system repair disk. I have scheduled backups and will be creating a system image. Hard drives do not last forever, but this time I will be prepared ( lesson learned ).
Joemt.

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My music is on an external drive as to not use up gigabytes of storage that need not be used for media.
There are a couple basic principles to iTunes that I believe you should know.
1. iTunes is not a media storage program. It does not store your media "in iTunes". It simply is an organization tool for your media already on a hard disk.
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You can't fix the issue of iTunes not seeing the media if your drive is unplugged unless you physically move the content to your OS HDD...Or any other HDD you use.

How do I Move Events from an Internal to External drive?

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Can anyone give some guidance on how I do this so i don't have to reload all my videos on the external drive.
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Can't see added internal or external drives?

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