Magnetic recording cartridge

A magnetic recording cartridge comprising:

• a cartridge case,
• a reel, and
• a magnetic recording medium having a magnetic layer, a non-magnetic layer, a base layer and a back layer,
• wherein an average thickness of the magnetic recording medium tT is 4.0 μm≤tT≤5.5 μm,
• a plurality of servo bands are formed along a longitudinal direction of the magnetic recording medium in the magnetic layer,
• the magnetic layer includes a magnetic powder and a first binder,
• the non-magnetic layer includes a non-magnetic powder and a second binder,
• the base layer includes a polyester resin,
• a dimensional change amount Δw in a width direction of the magnetic recording medium with respect to a tension change in the longitudinal direction of the magnetic recording medium is 700 ppm/N≤Δw≤2000 ppm,
• the magnetic recording medium is accommodated in a state of being wound around the reel in the cartridge case and 0.01 μm≤(a servo track width on an inner side of winding of the magnetic recording medium)−(a servo track width on an outer side of winding of the magnetic recording medium)≤2.5 μm is satisfied
• and wherein,
• wherein the dimensional change amount Δw is determined according to:
• Δ
• ⁢
• ⁢
• w
• ⁡
• [
• ppm
• /
• N
• ]
• =
• D
• ⁡
• (
• 0.2
• ⁢
• N
• )
• ⁡
• [
• mm
• ]
• -
• D
• ⁡
• (
• 1.0
• ⁢
• N
• )
• ⁡
• [
• mm
• ]
• D
• ⁡
• (
• 0.2
• ⁢
• N
• )
• ⁡
• [
• mm
• ]
• ×
• 1,000,000
• (
• 1.0
• ⁡
• [
• N
• ]
• )
• -
• (
• 0.2
• ⁡
• [
• N
• ]
• )
• where D(0.2N) and D(1.0N) represent widths of a sample of the magnetic recording medium subject to loads of 0.2N and 1.0N, respectively, in the longitudinal direction of the magnetic recording medium under 25° C. and 50% RH and a width of the sample of the magnetic recording medium is ½ inch prior to being subject to a load.