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In Reply to: Re: Burning for iPod playback posted by xmasparty@mac.com on April 3, 2006 at 09:35:46:
> Using Apple Lossless you can assume 10Mb per minute of play. Say 400-700Mb per CD.Actually, that's how big uncomressed WAV files are (CD's store about 700MB of data) Typically, lossless formats will compress a bit better than 50%, sometimes 60%, so you'll get double the apparent disk space. So, say, 550MB on average for an audio CD (most audio CD's arent' full) is about 225MB compressed, four CD's per gig, so about 240 full CD's on a 60GB iPod. That's a whole lot of music at your fingertips.
Depending on your quality settings, MP3's and AAC's usually do 10:1 compression, so a 550MB CD will squash down to 55MB, which is pretty impressive. Usually AAC will get file sizes down a bit more than MP3, though the MP3 compressor iTunes uses is very good, and can sound better than AAC at equal bitrate/sizes on some types of music.
When playing MP3's or AAC files on your iPod, they will be loaded into memory and the hard drive will spin down to save battery life. I think the buffer is around 8MB. Lossless files don't fit into this buffer, so the hard drive has to keep spinning up to read in more of the song, thus lowering your battery life. It's really the only downside to using lossless, other than the reduced song capacity of using larger files, and flash based players like the Nano don't suffer from this.
/*Music is subjective. Sound is not.*/
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Follow Ups
- Clarifications - jbmcb 10:33:16 04/03/06 (1)
- Real World Clarifications - xmasparty@mac.com 15:54:46 04/03/06 (0)
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