"Megabyte blocks" refers to a specific size of data that is added to a blockchain. It means that one block of information can hold up to one megabyte (1 million bytes) of data. Full definition
As a central issue, Bitcoin's one - megabyte block size limit was often insufficient to include all transactions on the network. (bitcoinmagazine.com)
Bitcoin Classic most likely plans to deploy a block size increase to 2 megabyte blocks through a hard fork once 75 percent of hash power agrees, and a four - week «grace period» for all full nodes on the network to switch to the new rules. (bitcoinmagazine.com)
Instead, the mining pool favors a hard fork to remove the one megabyte block size limit, as proposed by Bitcoin Core fork Bitcoin Unlimited. (bitcoinmagazine.com)