In <[🔎] AANLkTi=mj9Tsyk=OohqAbp8bat96k6FM5ZfBGyTG_8Cc@mail.gmail.com>, Yuwen Dai wrote: >I burn DVD/CDs from ISO files. In order to verify the burning is correct, >I wrote a script working like this: >1. mount the DVD and ISO files onto two mount points >2. calculate every file's md5sum in each directory, and save and sort them >in two separate files >3. compare the above two files. > >The above method does work, but too time consuming because of the md5sum >calculating. Do you have any suggestion to improve the efficiency? Don't waste CPU time on MD5. Don't waste CPU time performing filesystem operations. Compare the two images byte-by-byte using something like diff. What takes the most time though is the I/O. You could use statistical techniques to reduce the amount of I/O you perform at the cost of some accuracy. However, you are probably better off reducing I/O time by getting faster drives, particularly the optical drive. -- Boyd Stephen Smith Jr. ,= ,-_-. =. bss@iguanasuicide.net ((_/)o o(\_)) ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-' http://iguanasuicide.net/ \_/
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