Transmission

How do you know for sure the file had undiscovered bad pieces immediately after download to 100%, and while still on the original partition and at the original location? It is still in its original 12.04 partition and location. I copied the partition it is on to create a newer partition to upgrade ...

In the morning I'll boot up into the old Xubuntu 12.04 partition and see what Transmission says about the state of the files.
It was showing files as 100%. Here is one of them:

Properties of an iso in X12.04: http://en.zimagez.com/avatar/screenshot-010414-061801.png
Properties of same iso in X13 ...

Are you trying to download isos which may be modifying pre-existing files and while perhaps also seeding from another torrent?
Unless I misunderstand you, I don't think so. I download an iso and then it just sits there indefinitely. I think twice I've gone to download an iso I already have and I ...

So I checked the properties of the other files I had in Transmission and find of the 23 files I have, another 5 were in the same state: marked as 100% but the properties said I did not have 100%.
Can you elaborate on this? Are these multifile torrents with 1 or more files (originally) unchecked ...

Here is a patch that you could try: https://trac.transmissionbt.com/ticket/4649#comment:39
Ah. That made interesting reading. So it's not just me then.

Also, don't linux isos have checksums available that can be tested?
They do, but I had assumed (yes, I am old enough to know better) I had ...

BTW, it is Transmission 2.82 (14160) on Xubuntu 13.04 and these files were downloaded between 04/11/2012 and the last few weeks. When the files were downloaded this PC may have been running Xubuntu 12.04, 13.04 or 13.10 according to whatever state of upgrade it was at at the time.

I realised a file I had downloaded some time ago still had an upload ratio of 0.0 and I was trying to work out why. At one point I looked in Properties and saw I only had 80-something% of the file available despite it saying 100% on the front screen. So I verified the file it and the proportion ...