what make / model harddisk
This code is typically to protect the contents of the harddisk regardless if it is in the laptop or other device (i.e. Desktop)
Typically there may be a master reset password i.e. Western Digital WDC repeated multiple times. But these wipe the harddisk clean but allow the drive to be re-used.
Some need the firmware (on the HDD) read to recover code. Older drives simply had a flag that could be reset in the firmware. These days the actual drive data is encrypted via the key as it is written to the platter.
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