CD and hard drive music collections of 14-24s in the UK compared

"The average digital music collection - ie all the music on a respondent’s computer or hard drive - was 8,159 tracks. (If we equate a single track as being 3 minutes in length, that's approximately 17 days' worth of continuous music.)"
On the other hand:
"Respondents still exhibit a strong desire to "own" music and most still purchase CDs.
Only a small number of respondents (4%) do not use CDs at all and 51% have fewer than 100 CDs (both original and copied).
The average collection was 70 CDs for the 14-17's and 98 CDs for the 18-24 age group - a significant increase on 2008's figures."
Source: UK Music survey pdf, 10th August 2009