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I'm using uTorrent 3.1.3 and I'm getting the error "Disk Overloaded 100%" after the download speed reaches 4-5 mb/s. It lasts about 1 minute, it starts again with full speed and then it displays disk overloaded again. After the second "disk overloaded" error, the download speed raises to maximum and stays that way until the end of the torrent.

This is a very old problem I've had with utorrent since version 1.6.1 and have not found a solution all these years. I tried to tweak the caching settings (as suggested on other forums) but with no luck.

I know it's not my HDD (7200rpm, 32mb chache). Some people don't have this problem at all and their rig is similar to mine. Even the HDD is the same. What can I do?

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I would simply use the current version of uTorrent –  Ramhound Jun 1 '12 at 17:54
@Ramhound: 3.1.3 is the latest stable. –  Dennis Jun 1 '12 at 17:57
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5 Answers

up vote 3 down vote accepted

I fixed uTorrent 2.2.1 by selecting Pre-allocate all files in Preference -> General. Might work for other versions as well but I haven't tested.

Sadly, magnet links still work the same way.

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Disk Overloaded 100% means that the writing blocked. This can easily happen with a slow/busy disk, since the complete I/O is single threaded in uTorrent 3.1.3.

Try downloading the latest alpha release (3.3).

From µTorrent 3.3 alpha (27280) (Page 1) / Announcements / µTorrent Community Forums:

Release highlights:

Disk I/O system completely rewritten. Now multi-threaded and high performance. It will take advantage of multiple disks, perform better with even just one, and no one disk job can block everything (e.g slow network blocking local I/O, or allocating files)

It may not may not work well enough to use it (it's an alpha, after all), but at least you'll know if your problem will get fixed soon.

If it doesn't, consider using a different BitTorrent client. In my experience, Deluge works quite well for high speed downloads.

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But why is this only happening to some people? My HDD is not slow. I have a primary and secondary drive. I/O usage on the second drive shouldn't be busy at all since all I have on it are some recordings. –  Alexander Ceed Jun 1 '12 at 17:59
So many possibilities: 1. A slow/busy controller. 2. Malware. 3. Poorly written malware scanners. 4. The HDD went bad. (Try performing a diagnostic using the HDD manufacturer's tools from their site.) –  Dennis Jun 1 '12 at 18:04
@AlexanderCeed: I tried to diagnose this (I have this problem as well), and came to a conclusion that this is some kind of uTorrent bug; e.g. disk is not really overloaded when uTorrent claims so, so I think this solution is correct: either wait for a fix or switch to a different client. –  haimg Jun 1 '12 at 20:25
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You're getting disk overload errors because torrents upload and download pieces non-sequentially. Unlike a local file transfer, your drive is having to read and write hundreds of random parts of the file(s) all the time.

To fix this, you can manually override the disk cache size and/or lower the maximum number of peers allowed to connect.

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I fixed it by bumping up cache to 1GB. It seems to have this problem only on large torrents with many files, over 30, in my case. Problem is that disk needs to write blocks to many different locations and it gets too busy. If cache is big enough it will optimize writes to make it more sequential....

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I tried many, many different things before I finally found something that fixed the "Disk Overloaded 100%" issue for me.

I'm running Windows 7, uTorrent 3.2.3. (it's happened for me with the last several versions of uTorrent as well).

Options -> Preferences -> Advanced

Search for diskio.use_partfile

Set diskio.use_partfile to false.

Source: post #6 at https://forum.utorrent.com/viewtopic.php?id=118504

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