dictn={'disks':[], 'left':False, 'right':False}
    dictn['disks'] = (sorted(clusterdisklist))
    for n in clusterdisklist:
        if disks[n,0] - rad < 0:
            dictn['left'] = True
        if disks[n,0] + rad > 1:
            dictn['right'] = True
    cluster_list.append(dictn)