SSD's Too Full? - How much is Too much.

If the disk is only used for samples access free space does not matter.
 
Make sure a page file is not on the disk.
 
Stop system restore from monitoring the disk.
 
Run disk clean up to remove old deleted stuff: files and restore data.

Actually it is recommended to leave a big chunk free. The SSD firmware will use that space to maintenance.
If you have a Samsung you will notice that the software even allows to do overposition, which basically is creating a unpartitioned space with the recommended size (around 10%-20% if i recall), that way you dont need to worry about filling it up.

From the Web:

Don’t Fill Them to Capacity

You should leave some free space on your solid-state drive or its write performance will slow down dramatically. This may be surprising, but it’s actually fairly simple to understand.
When an SSD has a lot of free space, it has a lot of empty blocks. When you go to write a file, it writes that file’s data into the empty blocks.
When an SSD has little free space, it has a lot of partially filled blocks. When you go to write a file, it will have to read the partially filled block into its cache, modify the partially-filled block with the new data, and then write it back to the hard drive. This will need to happen with every block the file must be written to.
In other words, writing to an empty block is fairly quick, but writing to a partially-filled block involves reading the partially-filled block, modifying its value, and then writing it back. Repeat this many, many times for each file you write to the drive as the file will likely consume many blocks.
As a result of its benchmarks, Anandtech recommends that you “plan on using only about 75% of its capacity if you want a good balance between performance consistency and capacity.” In other words, set aside 25% of your drive and don’t write to it. Only use up to 75% of your drive’s free space and you should maintain ideal performance. You’ll see write performance start to slow down as you go above that mark.

The drives are Samsung and have been overly provisioned to provide plenty of room for 'Garbage Collection' activities. They rarely see any writes compared to the reads. I have been using SSD's for awhile so I am familiar with most of the 'Do's and Dont's' when using them.
 
My main concern is why Windows puts the Red Bar on a drive whose usable capacity exceeds 10% free space and if it could do something stupid to reduce the life span of the drive.
 
My solution was to order a larger drive, I will move some samples so I can gain some free space over all 3 drives. Probably a better solution would be to stop buying sample libraries...
 
Thanks for every ones help.
 
Kind regards,
Rick

Thanks for the info Sycraft!

Thanks for the reply jbow!
 
I ended up getting a Samsung 1TB on sale at B&H Photo for about $20 less than Neweggs sale price. B&H Photo also expedited shipping so I had it 2 days later.

Anytime my Friend!
 
If they don't have it on sale now, keep checking as their shipping and service is Great.