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I have a small laptop that I basically use for nothing but my Ethereum wallet, using Mist. I'm running out of space, so I added a 64gb SD card and I'd like to keep Mist running on the laptop but store the blockchain data to the SD card.

I followed instructions for making that change in Geth via terminal - designating --datadir to the directory of the SD card - but it doesn't seem to make any difference when I open Mist. The entries in the chaindata folder on my laptop's storage keep expanding and nothing appears on the SD card. Does anyone know how to do this?

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Mist has the data directory hard coded.

If you want to run geth directly, you can use --datadir. You might also use a symbolic link.

Not much more to say on this other than submit an issue on the Mist project if you'd like to see this changed.

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  • Oh, Ok. Well that settles that then. Thanks for the response! I've still got about 5gb of headroom, so hopefully a change is implemented before I run out, or worst case scenario I'll have to set up a wallet on another computer. In the meantime, I will submit a pull request as you suggest.
    – Ethcurious
    Mar 6, 2016 at 21:25
  • @Ethcurious had a brain fart, pull/issue.
    – linagee
    Mar 7, 2016 at 0:51
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Not tried this myself but how about creating a Symbolic Link to the chain data directory. e.g. something like

ln -s /sdcard/chaindata usr/library/ethereum/chaindata
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On windows you can run mist with --node-datadir="path/to/datadir" option to specify your data directory

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