<font color=#008000>If an external drive isn't appearing on your desktop or in Finder, first verify its connection and power supply, then check Disk Utility to see if the drive is recognized there, which helps isolate the problem.</font>
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<font color=#008000>To free up space efficiently, start by checking the 'System Data' section in Storage Management; it often contains old iOS backups and cached files you can safely remove.</font>