When you insert a CD into a drive attached to the computer in order to rip it to iTunes and choose "Import CD" you immediately get a dropdown menu that lets you choose the format, AAC, AIFF (the format that's on the CD), Apple Lossless, MP3 or WAV. So the files on your drive or XDHC card will be in whatever format you chose when you copied them. The default is AIFF, which is a lossless format, so if you didn't change that you should have full resolution AIFF files.
You should be able to see the file type of any file in your Music folder by following the instructions here. The file type will be the letters following the period after the file name. If it's an mp3 file it will be 'mp3, if it's AIFF it will be .aiff.
https://www.computerhope.com/issues/ch000573.htm
You should be able to see the file type of any file in your Music folder by following the instructions here. The file type will be the letters following the period after the file name. If it's an mp3 file it will be 'mp3, if it's AIFF it will be .aiff.
https://www.computerhope.com/issues/ch000573.htm