How to Transfer Music From a MacBook to the Android

Turn on your phone and your MacBook.
Use a USB cable to connect your smartphone to the MacBook. The USB end of the cable will fit into the computer, while the smaller end will go into the phone.
Wait for the 'Connect to PC' prompt to appear on your phone. Select the option labeled 'Disk Drive' and press 'Done.' This will allow your phone's internal storage and memory card to be modified by the computer.
Open at least two windows within the Mac Finder. One window should display the phone's internal storage or memory, and the second window should display your music collection on your MacBook.
Select the songs you want to copy onto your Android phone from the MacBook Finder window. Drag these files onto the smartphone's Finder window. A file transfer progress bar will be displayed. When the progress bar disappears, your songs will be transferred from the MacBook onto your Android phone.
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How to Erase Free Space on an iMac (5 Steps)

Quit all running programs and empty the Trash. To empty the Trash, right click on the 'Trash' icon in the Dock and select 'Empty.'
Click on the 'Applications' folder in the Dock or open a Finder window and click 'Applications' in the left pane under Places. Double click the 'Utilities' folder to access the contents of the folder. Double click the 'Disk Utility' icon to launch the application.
Select the iMac's internal hard drive by clicking on the 'Macintosh HD' icon in the left window. Click on the 'Erase' tab and click 'Erase Free Space.'
Choose to have zeros written over the free space once--seven times or 35 times--by clicking the radio button next to the option. Depending on the amount of free space on the hard drive, choosing the '7-pass' or '35-pass' option may take many hours to complete. Click 'Erase Free Space' to start the process.
Quit Disk Utility once the erase process is complete by hitting 'Command' and 'Q' on your keyboard or by choosing 'Quit' from the Disk Utility file menu.
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