SANDISK X300 512GB Reset to FACTORY CAPACITY

Software and Apps SANDISK Dashboard
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If you haven’t figured it out - I recommend you follow this guide (you may need to alter the Dell part if your system is different obviously). It will help you to clean your disk of any partitions. Please keep in mind, this will erase all user data. Please be careful in selecting the right disk if you have multiple in your system.

http://dellwindowsreinstallationguide.com/cleaning-up-a-drive-format-vs-secure-wipe-ssd-and-hdd/useofdiskpart/#UsingDISKPART .