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I'm trying to save some space so I tried a geth removedb and then a --fast resync.

But while browsing my .ethereum folder I saw this one which looks like a chaindata folder given its contents and is massive, 10Gb, what is its use ?

The geth removedb doesn't remove it, is it safe to delete it ?

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    The name of the folder is the hex representation of the first 4 bytes of the genesis block hash - eth.getBlock(0).hash gives the result "0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3" – The Officious BokkyPooBah Oct 20 '16 at 9:41
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you ve excuted an geth removedb which remove Geth's blockchain and state databases. and then you excuted geth --fast which enables fast syncing through state downloads instead downloading the full block data (condensed chain data) so you should have a chaindata folder with XGo. So you deleted an old chain and synced to a new one.

when you have this d4e56740 (inside you will find another blockchain :blocks,states..) folder it means you used another Ethereum Client besides geth client or multiple instances geth clients

|improve this answer|||||
  • Which client you know? – euri10 Oct 20 '16 at 9:36
  • did you use any other client eth,parity .. or did your run multiple geth instance? – Badr Bellaj Oct 20 '16 at 9:37
  • I used eth a while ago and I regularly run multiple geth – euri10 Oct 20 '16 at 9:38
  • that's why you have separated folder=separated blockchains – Badr Bellaj Oct 20 '16 at 9:39
  • That is why because of eth or the multiple geth – euri10 Oct 20 '16 at 9:40

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