Block or Buffer caches are used to
Ans: A
ref: https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwiGsJOq7qPWAhVFpo8KHYKlCrgQFggpMAE&url=http%3A%2F%2Fwww.tldp.org%2FLDP%2Fsag%2Fhtml%2Fbuffer-cache.html&usg=AFQjCNFTGu4JnoRF2asn1LbJH7_EODhqFA
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