Angular momentum loss in an isolated disk galaxy model with structural parameters as our ΛCDM run at ﹩z=0.6﹩. This model was run for 6 Gyr (equivalent to the present time). The y‐axis is the fractional angular momentum loss for all the baryonic material in the disk; the x‐axis is the radius. Solid line: ﹩N_{\mathrm{DM}\,}=100,000﹩, ﹩N_{\mathrm{star}\,}=200,000﹩, and ﹩N_{\mathrm{gas}\,}=5000﹩ (same as in the cosmological run). Our choice of spawning a large number of star particles (typically 6 per gas particle) in the cosmological run reduces internal heating of the stellar disk. Dot‐dashed line: Values are as above, but ﹩N_{\mathrm{DM}\,}﹩ and ﹩N_{\mathrm{star}\,}﹩ are reduced by a factor of 5. Long‐dashed line: ﹩N_{\mathrm{star}\,}﹩ is reduced by a factor of 25. Short‐dashed line: ﹩N_{\mathrm{DM}\,}=4000﹩, ﹩N_{\mathrm{star}\,}=8000﹩, and ﹩N_{\mathrm{gas}\,}=1000﹩. At the lowest resolution, the disk undergoes the catastrophic angular momentum loss reported in early simulations.