Context
A user may need to verify if a disk that was previously used as an Aerospike storage device, has been properly zeroized.Method
You should be able to grab the first 128K of a disk and verify there is no data:
# head -c 128000 /dev/sdb|hexdump -C 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 0001f400
or
# head -c 1024 /dev/sdb|od -An -t x1 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 *
You can also just print the lines that are not zeroed with:
sudo head -c 1048576 /dev/sde | xxd | grep -v "0000 0000 0000 0000 0000 0000 0000 0000" | less
If there isn't any data returned then it is zeroized.