disk utility
Hello
1- in disk utility if i choose APPLE HDD WDC WD10EALX-408EA0 Media volume then i erase it can this function erase entire my hard disk ? my iMac is a bit low and i want erase my entire disk for fix it.
i send an attachment for better understanding .
2- do you know any solution for more speed for iMac .such as program or any appplication in apple store?
iMac 27", macOS 10.14