Black Candles are bearish lines in candlestick and candlevolume charts. They signify that the closing is lower than opening for that time period.
CHKDSK, short for Check Disk, is a utility that checks the integrity of the files and file structure of your hard disk. I'll walk you through it. I have disk problems and you said I should run CHKDSK. Great.
Starting on Windows 98, the Windows operating system includes Disk Cleanup, a utility that makes it much easier for the user to manage available hard disk space. The Disk Cleanup utility is designed to free up as much disk space as possible and decrease the risk that the user will delete essential files accidentally.