[Peck]

Tx for the replies.

The reason I said to run at 0 and at other speeds is to check your loops. If you run at 0 and it moves, u know that your code is accelerating the disk before you collect the data which may cause choppiness in operation. If you run at other speeds and it still happens, That eliminates a possible error point.

Without seeing your code, all we can do is recommend things to try.

EDIT: almost forgot:

when running at 0, it will also show if you have something in your code changing the value by a set number or to a set number. when running on other values, u can see if there are any alterations by multiplication. If all other (meaning other then the one you want) speeds are fine, it ain't ur code (or you fixed it).