A striped volume (RAID-0) writes data in small blocks or stripes on two or more disks simultaneously. To create a striped volume you require at least two disks, however, having more than two disks participating in the striped volume will enhance further data access performance. That is, when data is written or read from a set of disks simultaneously the I/O bandwidth increases and hence, achieving better read and write transfer speeds. When creating a striped volume, the volume size is dependent on the disk with the smallest free space, as the portions of the disks included in the set need to be of the same size. I suggest to use full disks of the same size when creating striped volumes, otherwise, you end up with free spaces on some disks! While, the disks of a striped volume need to be converted to dynamic, remember that such volume is not fault-tolerant. If one disk fails, the entire volume fails.
If you suspect that one of your drives is not performing well or is not showing up in certain utilities such as, Disk Defragmenter then your first step would be a check disk operation. A Check disk operation includes automatic fixes for both file system and physical errors. To start this operation right-click a disk drive from the windows explorer or the Start menu Computer item. From the properties window, click the Tools tab and under Error-checking click Check Now.