<p>This is the critical error:</p>

<pre><code>2018-01-07 10:22:45 ERROR: ReadBlockFromDisk: Deserialize or I/O error - CAutoFile::read: fread failed at CBlockDiskPos(nFile=693, nPos=38137925)
2018-01-07 10:22:57 *** Failed to read block
</code></pre>

<p>I would 1st check if you have run out of disk space?</p>

CC BY-SA 3.0
2018-01-07T11:47:33.953Z
2018-01-07T18:30:25.847Z
2018-01-07T18:30:25.847Z
Anon User
<p>Bitcoin synchronized approximately on 60% and today in the morning I saw this error: "Error: a fatal error occured (see details in the debug.log)". Here's my debug log: <a href="https://drive.google.com/file/d/1BQ-3u1RfFT5r5hFDlTTlrG5ffdlOQsjT/view?usp=sharing" rel="nofollow noreferrer">debug log</a>
Kindly help me to solve this problem.</p>

<p><a href="https://i.sstatic.net/tuPO1.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/tuPO1.png" alt="error&#39;s screenshot"></a></p>

<hr>

<p>Bitcoin was installed on DataD. But I also see Bitcoin folder on Sys C.
Today in the morning there really was lack of space on Sys C.
I cleaned some space, and you can see the screenshots - free space underlined in green, the capacity of disks - in blue.
<a href="https://i.sstatic.net/zQdfx.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/zQdfx.png" alt="data d"></a>
<a href="https://i.sstatic.net/4sYA0.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/4sYA0.png" alt="sys c"></a>
So when there was 3Gb free space on Sys C, everything worked. Now I have the same error. Kindly tell me what else it's possible to do? 60% synchronization it's not everything, but a lot of time was spent on it.</p>

<bitcoin-core><error>
Bitcoin's error (debug file)
queenofwastepaper
# Bitcoin's error (debug file)

(Asked by: username_0 on 2018-01-07)

Bitcoin synchronized approximately on 60% and today in the morning I saw this error: "Error: a fatal error occured (see details in the debug.log)". Here's my debug log: [debug log](https://drive.google.com/file/d/1BQ-3u1RfFT5r5hFDlTTlrG5ffdlOQsjT/view?usp=sharing)
Kindly help me to solve this problem.

[![error's screenshot](https://i.sstatic.net/tuPO1.png)](https://i.sstatic.net/tuPO1.png)

---

Bitcoin was installed on DataD. But I also see Bitcoin folder on Sys C.
Today in the morning there really was lack of space on Sys C.
I cleaned some space, and you can see the screenshots - free space underlined in green, the capacity of disks - in blue.
[![data d](https://i.sstatic.net/zQdfx.png)](https://i.sstatic.net/zQdfx.png)
[![sys c](https://i.sstatic.net/4sYA0.png)](https://i.sstatic.net/4sYA0.png)
So when there was 3Gb free space on Sys C, everything worked. Now I have the same error. Kindly tell me what else it's possible to do? 60% synchronization it's not everything, but a lot of time was spent on it.

**Tags:** bitcoin-core, error


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## 1 answers

### Answer by username_1 on 2018-01-07. Score: 1

This is the critical error:

```
2018-01-07 10:22:45 ERROR: ReadBlockFromDisk: Deserialize or I/O error - CAutoFile::read: fread failed at CBlockDiskPos(nFile=693, nPos=38137925)
2018-01-07 10:22:57 *** Failed to read block

```

I would 1st check if you have run out of disk space?


---

