the difference between irq save and the irq disable ?

in my mind, irq save only store the conditions of that time ,  and the
following code can access the shared region and change it ,so modify 
irq  states .

while , disable irq  keeps the states of interrupt unchangable .

but , I have no knowlege of the difference between code in irq save
and irq restore and  in irq disable and irq enable ?

whethe the former can be interrupted and the later not ? only this ?
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