1.   A non-elastic limitation is the available disk storage capacity.

2.   In addition to greater disk storage capacity, he mentioned cost of production, which software producers say is considerably higher for cartridges than for disks.

3.   More significant than the disk capacity is the technology applied in the digital compression.

4.   Second, a couple of readers also questioned my math on the grounds that disk capacities are measured in binary terms.

5.   The second discrepancy involves disk capacities rounded off in millions of bytes instead of true megabytes or gigabytes.