can i do that? if yes, what is the price for each GB of a new disk?
Officially? No. Unofficially, Linode announced their beta for Block Storage which will allow you to add disks to your Linodes. $.10/GB normally, free during the beta.
It also depends on what you're talking about. Every Linode comes with a certain amount of space. You can always divvy up that space into as many disks as you want right now.
Block storage is for a large amount of additional storage for your Linode.
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