To troubleshoot this, please try the following: check the USB cable and ports, restart your MacBook, look for the drive in Disk Utility, ensure your macOS is up to date, reset the SMC and NVRAM if needed, and use Terminal to check for the drive (type 'diskutil list'). If these steps don't resolve the issue, there may be a problem with the drive itself, and you might need to contact Western Digital support or consider data recovery options.
