locked hard drive.
how can I get around a locked hard drive? if I install a new one will I bypass needing a code?
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If this is the firmware lock—then no.
If your Mac is using a firmware password, the lock icon appears when you try to start up from another disk or volume, such as an external drive or macOS Recovery. Enter the firmware password to continue.
About the screens on your Mac as it starts up - Apple Support
https://support.apple.com/en-us/HT204455#turnoff