Win10, Spotify active "Specified audio output device".

Support Windows 10 ONLY.

Win7, VirtualBox - Disable Time Sync.

Eclipse, show line number.

Path: Windows --> Preferences --> General --> Editors --> Text Editors --> Show line numbers

Win7, VirtualBox - Resize hdd to bigger (20GB to 40GB).

Step-01: Extend to 40GB as example
# VBoxManager.exe modifyhd filePath:/virtual-HDD-filename.vdi --resize 40000

Windows CMD: systeminfo

CMD: systeminfo