160GB 2.5" Thin HDD w/El Capitan 10.13.6 
You need one of these to run it 

These computers can run El Capitan if they have at least 2GB of memory and 8GB of available disk space: MacBook Air (Late 2008 or newer), MacBook (Late 2008 Aluminum, Early 2009 or newer), MacBook Pro (Mid/Late 2007 or newer), iMac (Mid-2007 or newer), Mac mini (Early 2009 or newer), Mac Pro (Early 2008 or newer), Xserve (Early 2009) 



This hard drive is plug in play(hard drive screws not included). Its ready to go, just set up your own user account and delete this temporary one afterwards, then you are all set.

SEAGATE 7200RPM 
 
This HDD SN:5TG0S9RX

This hard drive does NOT come with an installation disk. The operating system EL Capitan is already installed on the hard drive.

YOU NEED TO KNOW WHAT YOU DOING by deleting existing account and reinstall OS from the image. (please refer to YouTube guidance if you got lost)

Final Sale. No return or  a refunds except DOA or not as described issues.