<p>The reason is future pruning functionality.</p>

<p>Pruning will be implemented by simply deleting files (and related metadata in index databases) with only old blocks in them. Having smaller files means higher granularity in choosing what to keep or not.</p>

CC BY-SA 3.0
2013-05-22T21:38:24.183Z
2013-05-22T21:38:24.183Z
Pieter Wuille
<p>The blkXXXXX.dat files in the new Bitcoin-Qt client (v0.8.1) are about 130MB each in size, while the old ones are about 1.9GB in size each. Does anyone know the motivation behind this change?</p>

CC BY-SA 3.0
2013-05-22T19:40:10.013Z
The `blk*.dat` files should be around 10GB of total size. Are you sure your client is fully synced?
Steven Roose
CC BY-SA 3.0
2013-05-22T19:53:33.707Z
@StevenRoose My client is catching up. I see many blk*.dat files being created now. Each of them is 134.2MB in size.
Ning
<blockchain><raw-data>
The change to the size of blockchain data files
Ning
# The change to the size of blockchain data files

(Asked by: username_0 on 2013-05-22)

The blkXXXXX.dat files in the new Bitcoin-Qt client (v0.8.1) are about 130MB each in size, while the old ones are about 1.9GB in size each. Does anyone know the motivation behind this change?

**Tags:** blockchain, raw-data

> **Comments:**
> **username_1**: The `blk*.dat` files should be around 10GB of total size. Are you sure your client is fully synced?  
> **username_0**: @username_1 My client is catching up. I see many blk*.dat files being created now. Each of them is 134.2MB in size.  

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## 1 answers

### Answer by username_2 on 2013-05-22. Score: 2 | Accepted answer

The reason is future pruning functionality.

Pruning will be implemented by simply deleting files (and related metadata in index databases) with only old blocks in them. Having smaller files means higher granularity in choosing what to keep or not.


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