Ramdisk memory usage

[Theewara Vorakosit]

Dear All,
	I use redhat linux 9 with kernel 2.4.20-20.9. Linux supports 16
ramdisks with size of 4MB. So, all memory needed are 64MB. I want to know
that memory space for ram disk is allocated at boot time or when I really
use it?
Thanks,
Theewara

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