Its Generally Observed that when we download an image the Image size is Much less than the Recommended Flash Card Size.
eg
First Image Information CURRENT
Image Name s72033-pk9sv-mz.122-18.SXD4.bin
DRAM / Min Flash 512 / 64
Size ~~ 48 Mb
Second Image Information
Image Name s72033-adventerprisek9_wan-mz.122-33.SXH3a.bin
DRAM / Min Flash 512 / 512
Size~~ 78Mb
Why So ? Bcuz other files like config / vlan.dat dont demand Much space & For a Backup Image256 Mb would be Enough. Please Elaborate Your Answer