Unhandled exception: OperationalError: disk I/O error

### Step 1: Please describe your environment

* ZeroNet version: _____
* Operating system: _____
* Web browser: _____
* Tor status: not available/always/disabled
* Opened port: yes/no
* Special configuration: ____

### Step 2: Describe the problem:

#### Steps to reproduce:

1. _____
2. _____
3. _____

#### Observed Results:

* What happened? This could be a screenshot, a description, log output (you can send log/debug.log file to hello@zeronet.io if necessary), etc.

#### Expected Results:

* What did you expect to happen?

The issue does not name a source file or test and contains no reproduction steps or observed result. Start by collecting the missing environment details and checking the referenced log/debug.log file, then establish reproducible steps and an expected result. Done means the disk I/O error has a documented cause and a verified fix or clear handling behavior.

Written by the indexing model from the issue text.