On Fri, 20 Nov 2009 15:48:34 -0800, "Ronald F. Guilmette" <r...@tristatelogic.com> wrote: > But I have one question. The author sez to do this: > > dd if=8.0-BETA1-amd64-memstick.img of=/dev/da0 bs=10240 conv=sync > > I just want to know what the effect of conv=sync and why it might be > necessary.
According to "man dd": bs=n Set both input and output block size to n bytes, superseding the ibs and obs operands. If no conversion values other than noerror, notrunc or sync are specified, then each input block is copied to the output as a single block without any aggregation of short blocks. in conjunction with conv=value[,value ...] Where value is one of the symbols from the following list. sync Pad every input block to the input buffer size. Spaces are used for pad bytes if a block oriented conversion value is specified, otherwise NUL bytes are used. it appears that the data is ensured to be "properly aligned" with a possibly different block size on the source or target media. As far as I remember, not giving the bs= argument would result in a default block size of 512 bytes which may - but don't ask me why - lead to a non-functioning target USB stick. -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ... _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"