Hi, may i know what method that mirc has been used to ensure that the files download using dcc is not corrupted?
(like when resuming or after finished downloading the full files?)

I'm not sure if it does check for corrupted files? mIRC isn't a file trading program, the DCC feature is a simplistic one, mainly made for transferring small files between friends.

Regards,

I don't know what it's called, or even if there is a specific/proper name for it, but when files are transferred via DCC, there is a "block" check made to ensure that "block A" sent is the same as "block A" received. The default for these blocks is 8192 bytes. Aside from that, I'm not aware of any other checking that is done by mIRC.

those "blocks" are just the amount of data mIRC sends before it waits for the other client to tell it the data has been recieved before sending more data.
These "blocks" are called packets, and every program which uses tcp/ip uses them to send/recieve data. Thats the way the tcp/ip protocol works.

The whole /dcc command and DCC sending would have to be rescripted on both clients to allow for curruption checking,