In my case, I needed to make an exact image of the source drive, so I felt dd was the appropriate tool. I don't remember the bs - perhaps 1k? Thanks for the hint. JD --- Matt Graham wrote: > From: Jorge Delacruz > > Matt Graham wrote: > > > 2M/s? That doesn't sound right for either USB1 > or USB2. > > I plugged in a USB drive and [dd'ed] the internal > drive to > > a file on the external USB drive. It took 9 hours > to dd a > > 40 GB internal drive, so 1.2 MB/sec > > What did you specify for bs= ? 32k or 64k would > have probably > worked the best. If you don't specify a bs= , dd > reads and > writes 512-byte blocks. This is ... suboptimal, as > 64 reads of > 0.5K take much longer than 1 read of 32K. > > > I used USB2 hardware. Maybe this is a limitation > with dd? > > The external hard drive's light blinks a lot and > the box > > seems I/O bound when I do it. > > Of course it's going to be I/O bound; you're doing a > whole > bunch of I/O. See above for a possible explanation. > Also, > dd is the stupidest backup method in existence as it > copies > everything including blocks that aren't in use. Use > partimage > or tar or rsync; that's what they're there for. > > > --------------------------------------------------- > PLUG-discuss mailing list - > PLUG-discuss@lists.plug.phoenix.az.us > To subscribe, unsubscribe, or to change your mail > settings: > http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss > ____________________________________________________________________________________ Need a vacation? Get great deals to amazing places on Yahoo! Travel. http://travel.yahoo.com/ --------------------------------------------------- PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us To subscribe, unsubscribe, or to change your mail settings: http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss