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In a moment of inattention, I ran luksFormat on /dev/sda instead of on /dev/sda1. Now I would like to undo that operation. Checking man for cryptsetup doesn't reveal an obvious method.

`lsblk -f1 shows the following:

sda          crypto_LUKS                       45e143e4-7d5b-4f20-b552-f301ced442f4 
└─sda1       crypto_LUKS                       55c24c05-d113-4df5-2715-f0d4072f5343

Normally, when I do this, there is no output to the right of sda. That's the state where I would like to end up after correcting my mistake.

I can lose sda1 at this point too. There is nothing important on it and I can recreate it in a minute. In short, I would like to start over with this block device after my mistake. However, running gdisk /dev/sda and making a new partition table and a new partition does not remove the crypto_LUKS from sda.

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If there's no issue with recovering/keeping any data on the drive, and using gdisk (or equivalent) directly to make a new partition table does not work, you can wipe the header (and any partition tables) on the block device with dd if=/dev/zero of=/dev/sda bs=8M count=4. That should let you create a fresh partition table on the device with gdisk afterwards.

NOTE: This operation is destructive, so make sure to assign the correct device to the of= option!

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