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.
Using Disk Utility to verify or repair disks. Learn about using Disk Utility to verify or repair disks. Disk Utility can verify your computer's startup disk (volume) without starting up from another volume.