Hi Subodh,
These memories are specific to processor level.
There are two types of processors in the supervisor card.
1.Switching processor
2. Routing processor
Memory of switching processor is sup-bootflash
Memory of Routing processor is bootflash
The booting sequence of the supervisor would be SP and then followed by RP.
Pls refer the below link.
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/intro.pdf
As a best practice, always the bootvariable should point to the image in sup-bootflash since SP boots up first.
Disk 0 & Disk 1 are the external memory slots. You can insert a compact flash card in it.
This will be used sometimes if the IOS image is of larger size than that of sup bootdisk or bootflash
When you enter the boot command without any arguments, the switch attempts to automatically boot the system by using the information in the BOOT environment variable, if any. If you supply an image name for the file-url variable, the boot command attempts to boot the specified image.
When you set boot loader boot command options, they are executed immediately and apply only to the current boot loader session. These settings are not saved for the next boot operation.
Hope this answers your questions.
Cheers
Somu
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