Requirements:

1. OpenSeaChest installed and unpacked
2. Empty harddisk
   
   Identify drive by scanning

openSeaChest_Info --scan

Show if it supports both 512 and 4096 byte sector sizes

openSeaChest_Format -d FD7 --showSupportedFormats

And swap to 4096 or 512

openSeaChest_Format -d FD7 --setSectorSize=4096 --confirm this-will-erase-data

or

openSeaChest_Format -d FD7 --setSectorSize=512 --confirm this-will-erase-data

Power cycle the device