This was true when drives were formatted with the same number of sectors on each track, regardless of position. Because the inner tracks had a shorter circumference, the bit density was highest on the innermost track. Now that drives are not directly addressed by cylinder/head/sector, the number of sectors can vary by track, so bit density is evenly distributed, outer tracks have more sectors than inner tracks. Where you see this limitation was on older MFM and RLL drives where the controller was not integrated onto the drive itself (pre-SCSI and pre-IDE). Jack Peacock