Hi Florian, good advice to look for the block/sector size. Didn't knew, that they are still this small :) I'll give it a try with smaller chunk sizes.
Would be interesting how big the sector size on a Mac HFS+ is. If it differs to Win, I could work with two different chunk sizes, depending on the system. Perhaps anybody knows? Thank you Tiemo > -----Ursprüngliche Nachricht----- > Von: [email protected] [mailto:use-revolution- > [email protected]] Im Auftrag von Florian von Walter > Gesendet: Mittwoch, 21. Januar 2009 13:52 > An: How to use Revolution > Betreff: Re: what is the bottleneck when copying file from CD? > > Tiemo, > > first your chunk sizes are too big. The copying speed is largely > dependent from the sector size of the media you are copying from and to. > The standard DVD sector size is 512 bytes iirc. The sector size on the > disk of the computer you are copying to is dependent from the file > system being used and how it was initially set up. The standard sector > size for NTFS under Windows nowadays is 4096 bytes (4k) but it can vary > from 512 bytes to 16k. For FAT I don't know the sector sizes. For HFS(+) > under MacOS I also don't know it. > Second the copy speed for DVDs depends heavily on the DVD drive itself > (i.e. the firmware) and how the OS driver is implemented. > Third OS caching also comes into the picture. > > I would recommend to try to use a chunk size of 4k maximum (also try > 0.5k to see if this is faster). > Bigger chunk sizes don't make sense because they probably just replicate > data what is in the OS file system cache anyway (and therefore increase > the memory footprint of your application). > Everything else imo depends on factors you cannot influence. > > Regards, Florian > _______________________________________________ use-revolution mailing list [email protected] Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
