MP3, AAC Corruption

Lately on my 2G ipod many of my songs are being corrupted or crossed with other songs. Is this a sign that the Hard Drive is failing or did Tech Tools incorrectly repaired my ipod incorrectly? If it is failing is it because of a bad Hard Drive sector or something else? If there are any sites were I can replace my Hard Drive with a higher capacity 1.8" Toshiba tell me like a 40GB or a 60GB. I already know that if the ipod is repaired by a non-apple technician it voids the warranty, Apple warranty does not cover my ipod any more since it is about 3 years old.
If you are an Engineer please answer in a technical way, if not then me your opinium. (Sorry about the misspelling my keyboard is acting strange.)

From your description it sounds like you've imported the music from your CDs in Apple Lossless (which is ".mp4" just as AAC is. The file extension for both file types is going to be .m4a.). These files retain the full quality of the music on the CDs without throwing away any data (hence Lossless), but they can be very large files. As you have discovered. But never fear -- there is no reason for you to re-import anything. Since your files are in Lossless you can trans-code them to AAC or MP3 and it will be just like you imported them off the CD.
First, you want to sort your Library by Kind. Pull down Edit > View Options. Check Kind and click OK. In your Library click the Kind column to sort the tracks.
Now you want to make sure your Import settings are correct. Open iTunes Prefs > Advanced > Importing and select either AAC or MP3 if neither one is already selected. Click OK.
In your Library find all the files that are Apple Lossless files and highlight them by Shift+Clicking the first file then the last file. Now Right+Click the files and select the Convert Selection to XXX item in the contextual menu.
Depending on how many Lossless fles you have this may take a while. When the process if finished you can delete the Lossless files from your Library and Hard Drive is you want to, but it is not necessary. But deleting them will free up a large amount of space.
In the future you should be mindful of the forum you are posting in. This is the iTunes for Mac forum, and if your problem is specific to Windows you will get more effective help in the iTunes for Windows forums. But this is straightforward and works the same on both platforms.

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