Hard Disk information not detected
 

I have an iPad 12.9 1st gen, removed nand IC and not detected by JC Tool.
When using Magico Box I get this message when I click Read Information
>>> Reading hard disk information
Hard disk information not detected... bad hard disk contact or damaged partition table!!!...
This hard drive will report error: 9 or 6 or 14...
Please try [Erase All]!!! If you still can't detect the hard disk information!!! Write [write to the hard disk partition table]

from watching videos I use Erase Partition option and choose retain partition information, but after I still receive same message when I click Read Information option.
My question is, if I choose ERASE ALL, will I still have a chance to pull bottom layer information or ERASE ALL = LOSE EVERYTHING?

Thanks