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.
In the Disk Cleanup dialog box, select the checkboxes for the file types you want to delete, tap or click OK, and then tap or click Delete files. If you want to free up even more space on your PC, tap or click More Options and choose from the options: Programs and Features.