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Dd linux copy fast transfer6/13/2023 If youd like to copy the content of the folder use either rsync: rsync -vuar src/ dst/. For example: dd iffilename offilename2 convucase dd if/dev/urandom ofmyrandom bs100 count1. Figuring out how long the actual content is, isn't trivial, but it's important. The main purpose of dd utility is to convert and copy files. And the size of kiosk.img ends up being much larger than necessary.Īgain, the default is for "dd" to copy the entire length of the source storage device, which could be much larger than the actual content. Like this: $ sudo dd if=/dev/disk5 of=kiosk.img bs=(content size in bytes) count=1 & syncįinding out the content size is not trivial (it depends on the source, how it was created, etc.), but the actual content might be 10% of the size of the source, which explains why all reads and writes take so long - much longer than necessary. The sync argument is very important - it flushes final writes to the device at the end of the process, to avoid having an incomplete device.Īnother approach is to find out how long the image is on the source device, and only copy that much data to the image file. The bs argument creates a block read, so it's faster. This means that while it is outputting 100kB/s, gzip can consume 1MB/s, and the rate of consumption is what dd can see.This may help: $ sudo dd if=/dev/disk5 of=kiosk.img bs=4M & sync So in this case, the network can handle 100kB/s, and gzip is compressing the data around 10:1 (and isn't being bottlenecked by the CPU).
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