data recovery - Recover 1TB disk erased with startup disk creator

Hello. I was trying to make a bootable flash drive from the startup disk creator, and when I went to erase the flash drive I accidentally erased the wrong drive, a 1TB removable drive. The operation took less than a second and gave no warning. I tried erasing the flash drive and it took about a minute, but it took but a second to erase the 1 TB drive, which is very surprising.

Please help,
Gabriel

Try to recover the partition with TestDisk.
Careful: don't write on the drive.

Instructions step-by-step:

1. Install TestDisk


2. Mount the drive


3. Launch sudo testdisk (eventually enlarge the terminal)


4. Create a new log file


5. Select the drive


6. Select partition Table (usually Intel should be good)


7. Analyse


8. Quick Search (this should found only the actual partition)


9. [Enter]


10. Deeper Search (this should find your old partition, you can stop it after it found it) Once you found what you think it's your partition select it with up/down arrows


11. [P] for list files and look if it seems it


12. [q] to quit list files


13. [Enter]


14. Write to save new partition table to MBR.

Look carefully: this don't overwrite / recover any data, just the MBR of the disk.