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Why would itunes strip data from .wav files? 3 Qs:

Friends,

Turns out I did not lose metadata, only data. But I am having a meta-bummer ("a bummer about bummers") as a consequence.

Three months ago, I began to store itunes music from a large CD collection on an outboard 500 GB WD hard drive. Lots of good advice here at Audiogon re: how to hi fi a computer system. Audiogon posts, along with some generous consults from veterans, led me to buy a second hard drive (also a WD, but bigger at one TB), along with a Squeezebox, and an Ipod.

I have been slowly ripping CDs to itunes, and had about 3,000 songs as .wav files. I plan to convert them to ALC in a Smart Playlist once my Ipod gets full.

When I copied HD#1 contents to HD#2, both hard drives dropped artist, album, genre, composer and showed lots of "can't find the path" exclamation points (!).

With help from several Audiogon users I have successfully recovered my .wav files and reduced !s. (delete Library, Import Folder from HD#1 titles 'itunes music'). But everything appears as a song name only.

QUESTION #1: CAN I FIND THE MISSING DATA? IS THERE A SEARCHABLE FILE EXTENSION? OR DID THEY SIMPLY DISAPPEAR?

QUESTION #2: THERE SEEMS TO BE NO ALTERNATIVE TO RE-RIPPING HUNDREDS OF CDS BY PHYSICALLY PLACING THEM IN MY PC'S CD DRIVE. (NO ONE DESCRIBES A PROCESS OF SIMPLY SENDING CD DIGITIAL OUT TO LAPTOP AS A PCM STREAM.) IF I HAVE TO GO THROUGH THAT LIVING HECK AGAIN, HOW DO I AVOID A RECURRENCE OF THE DATA LOSS DURING BACKUP?

QUESTION 3: Apparently because I use an external HD, I have to disable error-correction when ripping in itunes. I am not too computer facile (this may already be apparent), but as long as I am taking the time, I would like to invest a few more minutes and use error correction in itunes. (I am not ready for EAC yet.) Can it be done?

Thanks to all of you who posted and emailed.

Cheer,
Rick_van
rick_van
sufentanil's avatar
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sufentanil
782 posts
 
OK, some questions about your setup/process. First, what platform are you using (Mac or Windows)? Second, when you copied the data from HD 1 to HD 2, did you subsequently add the contents of HD 2 to the library (or is HD 2 on a directory that is automatically scanned by iTunes)?

Correct me if I'm wrong, but you are saying that you used to have metadata for WAV files that included song name, artist, etc but now WAV only has song? You may be discovering the dark side to using WAV files (which is why I argue for FLAC use instead). WAV does not have good standard ways to represent metadata. Some software can simulate metadata in WAV files by storing data external to the files; someone who knows the working of iTunes better than me can confirm if iTunes is one of those programs.

Michael
jax2
3,031 posts
 
Per Sufentail; I don't believe you can 'tag' WAV files with Metadata. You may need to take two extra Advil for you Metabummer. That said, iTunes has some means within the software to associate metadata with the WAV files. You have somehow broken the link, I suspect. Unfortunately, like yourself, I am only marginally binary-literate. You may be able to salvage the files themselves by re-importing them into iTunes (though I doubt you'll get all of the metadata back that way). My two strong suggestions is to seek advice on the Apple forums (plenty of Star Wars-loving types there with large craniums bursting with knowledge they are happy to share), or make an appointment at your local Genius Bar (at every Apple Store) for Mensa Martini.

Marco
sufentanil's avatar
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sufentanil
782 posts
 
Marco, WAV files DO have segments that are reserved for metadata-like information. The problem is that there isn't a standard way of placing the information into these segments. Next-generation lossless formats (such as Apple Lossless and FLAC) are much better in this regard (and use only about 50% of the space). That's one of the major reasons why when we have a WAV vs FLAC debate, I'm firmly on the FLAC side.

Rick_van, if you copy the data back to the original location, does it get better? And which library did you delete? Did you create a new library for the files in the location that you copied TO, and then deleted it (leaving the old library in the original location), or did you only have 1 library to start with, and subsequently delete it?

The good news is that if you do need to re-rip the CD's to reestablish all of the info that you're missing, there are commercial services where you send them CD's and a hard drive and they do the legwork. Maybe you'll choose Apple Lossless format instead of WAV.

Michael
herman
2,253 posts
 
iTunes did not "strip" the data. It was never part of the song file. The other stuff was stored elsewhere and the link to that data is gone. It now shows as a song name only because that is all that the wav file contains.

It was a bad idea to use a program like iTunes to store wav files since it was designed to store data as mp3 or Apple lossless. You can avoid a re-occurence by using the program as intended and use Apple Lossless. You can always create a wav from Apple Lossless if you feel the need to do so.

Apparently because I use an external HD, I have to disable error-correction when ripping in itunes.
Why? I have ripped a lot of CDs to external drives with error corerction on.
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