BT does it's own checking on the parts of the files as it gets them, if any part isn't perfect it discards it and gets another copy from somewhere else. Thus the errors you saw logged. No a problem, just an indication that BT is doing what it was designed to do. If BT finishes the download you have good copies.

The md5 test isn't needed as much after a BT download, but you have the files and it's a reasonable recheck to do. I did see one case where someone stopped BT as soon as the indicator hit 00% but before BT was really done, andf he did have a bad copy that the md5 would detect. Another nice thing about BT is that in such a case you can just restart BT, it will take a few minutes to check what you have, and then it will quickly fix the download by getting the missing parts.

Low speed burning of the ISO is pretty important for a reliable boot. Absolutely important is making sure that you burn the ISO as an image, lots of people just try to copy the ISO to a disc or extract files from the ISO or take some option to make the disc "bootable" or make some other choice that conflicts with this part of the instructions. I don't know what burning software that you are using so can't be more specific, but this is all covered in detail in the downloading faq.


Since you now seem to have md5summer working, can we assume that your previous ISO downloads were determined to be bad?