Data storage device

A data storage device comprising a motor having a stator, the stator comprising:

• a substrate having a first surface and a second surface opposite to the first surface;
• and
• a n phase winding arrangement having n phase windings;
• wherein each of the n phase windings comprises a first set of m flat fractional-pitch coils arranged on the first surface of the substrate such that the m flat fractional-pitch coils are spaced apart uniformly along a closed loop and connected in series;
• wherein each one of the m flat fractional-pitch coils, together with an angular section of the substrate between the one of the m flat fractional-pitch coils and an adjacent one of the m flat fractional-pitch coils of one of the n phase windings defines a stator pole-pair;
• wherein m is an integer larger than 1;
• and
• wherein each of the n phase windings further comprises a second set of m flat fractional-pitch coils arranged on the second surface of the substrate such that m flat fractional-pitch coils of the first set of m flat fractional-pitch coils are at least substantially in alignment with the m flat fractional-pitch coils of the second set of m flat fractional-pitch coils.