Click on Local Disk D, request is made to format, well I do not want to forma I do not want to loose the data.
What makes you think this hasn't already happened? Can you access D: in Windows Safe mode (not sure if that would be allowed anyway but it's worth a try)? If so go in there, BACKUP YOUR DATA and then immediately start again from scratch with a format and restore. Otherwise you could try booting from another drive - perhaps a bootable USB Drive and see if that lets you get at D: (or whatever it shows up as).
Even with RAID 0+1 (I have this on my PC) its still essential to maintain regular backups of valuable data because although an individual drive failure will not be a disaster, multiple simultaneous drive failures, a virus infection or more commonly, motherboard failure or mis-configuration, can and often does, spell disaster. Companies and organisations with RAID setups incorporating redundancy regularly perform backups for this reason. Good luck with your attempts to boot from another drive and access this RAID 10 array that way or in safe mode. If you still have troubles and the data is very valuable, there are professional data restoration companies out there that offer their services but they aren't cheap.
I boot from a seperate boot & os drive.
The D Drive is not accessable from My Computer or anywhere else.
The Intel Rapid Storage Technology Utility says it has rebuilt the array and refers to it as the original name I gave the array when I first created it, "Raid Group 10" it is an array of 4 each 640 GB SATA 3 HD's.
In the My Computer Window, it shows two Drives
#1C300- 256 MAG SSD, my boot & OS Drive
#2 "Local Disk D" unaccessable, but click on properties, tab Hardware, it shows the #1 C300 and it shows "Raid Group 10"Location 0
#3 My DVD
So my 1+0 raid array is there and appears to be intact, even the Drive name I gave it originally, so what do I need to do, change to show up in my computer as "Raid Group 10"?
I go into Disk Management, there it is identified as Disk Location 0 and is identified to contain only 596 GB, which is correct the 4 disck arry in raid 10 only show capacity of the lowest cap of the group, in my case all 4 are equal at 640 GB.
There must be Bio setting I am missing or a property setting, something somewhere.
It seemed this has happened previously and I made the change, but I have no idea what it was, and I have tried everything I could think of....somebody must know how to make this correction.
Sorry, it's not something I have that much experience with - if I have a problem with my array (that has only ever happened a couple of times and each time due to power failures/forced powering off) I either let it sort itself out (automatically) or format, reinstall and restore from backups. Maybe the Intel RST User Guide here may help? If the data is very valuable, it may pay you to consult the services of a data recovery company - unless anyone else in this community can chip in with the voice of experience?