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.
To run computer diagnostics on Windows Vista or Windows 7 (on which this PC diagnostic tool is called Check Disk), click Start and open Computer. Right click the disk you want to scan, which will likely be Local Disk (C:), and select Properties from the right-click menu.