One of the possible causes of disk recording error, jitter is actually defined as a "timing problem." Simply, jitter is the result of pits on a disk being or appearing to be too short or too long, based on a certain clock cycle. For example, pits on a disk can range from what is called a "3T" pit to an "11T" pit. If a pit that was intended to be written as 3T varies or is perceived to vary from the length of a 3T pit beyond a certain time period, it can be interpreted incorrectly, resulting in a possible disk error. This deviation is known as "jitter." The same is true for lands.