I have 10 hard disks in my Windows 8.1 system. In Computer Management / Disk Management, every disk display has a colored bar over the rectangle representing the disk surface; the bar has sections corresponding to the partition scheme of the disk. Nine of the hard disks have a dark blue colored bar, while one (disk 7) has a light green, almost pastel colored bar. There is nothing to distinguish this disk from the others, except possibly that it is a bit older according to the SMART data. Some have MBR partitions and some have GPT, and that does not effect bar color. Does anyone know if the color of the bar has any significance?