Yes there is a 4gb single file limit on Fat 32, I have used dd to create floppies and bootable usb sticks and DVD / CDROM ISO images it does a very good job but personally I'd prefer to use partimage, which is on the systemrescuecd.
dd is useful for creating mirrors of other filesystems it is especially good at creating iso images eg dd -if=/dev/cdrom of=cdromname.iso. partimage is just my personal preference for disk imaging and backup / restore. Regards Richard 2009/12/20 Stewart Robertson <stewar...@aliencamel.com> > Have just found this information at the following address. Has anyone > else tried it or can confirm it as an effective method? > > http://www.softpanorama.org/Tools/dd.shtml > > *Getting around file size limitations using split* > > When making images, it's quite easy to run up against various file size > limitations. One way to work around a given file size limitation is to use > the > split<http://wiki.linuxquestions.org/index.php?title=Split&action=edit>command. > > # dd if=/dev/hda1 | gzip -c | split -b 2000m - /mnt/hdc1/backup.img.gz. > > > 1. This example is using dd to take an image of the first partition on > the first harddrive. > 2. The results are passed through to > gzip<http://wiki.linuxquestions.org/wiki/Gzip>for compression > - The -c option switch is used to output the result to > stdout<http://wiki.linuxquestions.org/wiki/Stdout>. > > 3. The compressed image is then piped to the > split<http://wiki.linuxquestions.org/index.php?title=Split&action=edit>tool > - The -b 2000m switch tells split how big to make the individual > files. You can use k and m to tell switch kilobytes and megabytes (this > option uses bytes by default). > - The - option tells split to read from > stdin<http://wiki.linuxquestions.org/wiki/Stdin>. > Otherwise, split would interpret the /mnt/hdc1... as the file to be > split. > - The /mnt/hdc1... is the prefix for the created files. Split will > create files named backup.img.gz.aa, backup.img.gz.ab, etc. > > To restore the multi-file backup, do the following: > > # cat /mnt/hdc1/backup.img.gz.* | gzip -dc | dd of=/dev/hda1 > > > 1. Cat recombines contents of the compressed and split image files to > stdout <http://wiki.linuxquestions.org/wiki/Stdout>, in order. > 2. Results are piped through gzip for decompression. > 3. And are then written to the first partition of the hard drive with > dd. > > > > Stewart Robertson wrote: > > Thanks for the analogy Richard. > > Thankfully I was using a Live CD so in theory no robots managed to get to > the town and start re-building while thinking it was available space which > is why I have my fingers and toes crossed. I am however beginning to accept > that the phonebook is long gone. > > I purchased a 1TB external HD and mounted it while using System Rescue CD > but it would only mount read only because it was formatted as NTFS. I > connected it up to Linux Mint and used GParted to format it as FAT 32 then > remounted it on the laptop. > > I want to create an image of the drive in case I cause further damage so > have been using dd but it keeps falling over at 4.3GB and reporting 'File > too large'. > > Various searches suggest that dd can be used to image whole drives but some > places suggest there is a file size limit for FAT32. If I reformat the > external as ext3 it should handle the larger file size but can I then use it > to store any files found by photorec before transferring them back on to > Windows (i.e. can Windows mount an ext3 formatted drive and access files on > it)? > > Stewart > > > > _______________________________________________ > Peterboro mailing list > Peterboro@mailman.lug.org.uk > https://mailman.lug.org.uk/mailman/listinfo/peterboro >
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