What a service! - could have thought about wikipedia myself, sorry Thank you! Tiemo
> -----Ursprüngliche Nachricht----- > Von: [email protected] [mailto:use-revolution- > [email protected]] Im Auftrag von Florian von Walter > Gesendet: Mittwoch, 21. Januar 2009 15:36 > An: How to use Revolution > Betreff: Re: AW: what is the bottleneck when copying file from CD? > > Hi, Tiemo, > > HFS+ sector size seems to be 512 bytes according to > http://en.wikipedia.org/wiki/HFS_Plus. > CD-ROM sector size is 2352 bytes gross and 2048 bytes net according to > http://en.wikipedia.org/wiki/CD-ROM. > DVD-ROM sector size is 2418 bytes gross and 2048 bytes net according to > http://en.wikipedia.org/wiki/DVD-ROM (so I was wrong with my 512 bytes). > > Regards, Florian > > Tiemo Hollmann TB wrote: > > 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 > > > > > _______________________________________________ > 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 _______________________________________________ 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
