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Hi, My 1TB external hard disk is not showing up in Explorer. In Disk Management, all of the options are grayed out except for "Delete Volume".

I tried to use testdisk to recover the partition, please check the below images and let me know what should I do :

showing total sectors of the External HDD with DiskInternals Linux


After analyse with testdisk

After quick search with testdisk



Is it necessary to do deeper search? Please tell me what should I do ?

The partition table of your external disk seems broken.
After Analyse and Quick Search, choose Write, confirm, Quit and restart your computer.
You should be able to access your external disk again.