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#31
phaedruspress:
If you made two disks (connected to two computers using one usb2sata converter) damaged, then there is something wrong with your converter, do not use it. Connect your disks either directly to sata or using another converter.
You can gain some knowledge of gpt partitioning scheme from GUID Partition Table - Wikipedia - as you can see, partition table should be stored twice, at the beginning and at the end of disk, so it can be restored if the first copy is damaged.
Standard 4TB disk should have 7814037168 sectors, they are numbered from 0 (not from 1) to 7814037167. Important data are at these sectors:
Sector 0-33 ... "protective" sector + efi marker + gpt table
Sector 7814037135-7814037167 ... copy of gpt table + efi marker.
The first thing we need is copy of these areas of your damaged disk. It can be done using HxD or BootIce or other hex editor. So it is necessary these data to be copied to files; it can be done by you or other person.
There are many ways how the disk can be damaged, not only protective sector. So sharing these areas of your disk with more people for analysis is necessary.