On Tue, 16 Jan 2007, Chuck Hast wrote:
> On 1/16/07, Eben King <eben01@verizon.net> wrote:
>> Sorry, I don't have the original article.
>>
>> On Sat, 13 Jan 2007, Chuck Hast wrote:
>>
>> > On 1/13/07, Chris Mathey <slug@mathey.org> wrote:
>> >> Chuck Hast wrote:
>> >> > I have been moving some music from CD's to a HD I have. I notice
>> >> > that on the CD it is one size but as the file is moved to the HD it
>> >> > grows larger, here is a example, MP3 file that was 2.4MB on the CD
>> >> > when moved to the HD grew to 3.7MB. Is this a function of
>> >> > compression on the CD or am I seeing something else?
>>
>> There is no compression on a CD generally; most CD/MP3 players can't read
>> it if there is. MP3s wouldn't compress much anyhow. Try doing "stat
>> sourcefile destfile" and see what turns up.
>>
>> >> > By the way, the size is not a direct relationship, one file which is
>> >> > 4MB on the CD is 5.9MB when copied to the HD, another which is also 4M
>> >> > on the CD is 5MB on the HD.
>>
>> Well, one "4MB" may be the result of rounding down from 4.4 MB and the
>> other up from 3.6 MB, a 22% difference swept under the rug. One digit's
>> too small to draw any conclusions. Unless it's really 4.0MB in both
>> initial cases; then I have nothing.
>>
>> >> > I am assuming there is some compression issue here because I have
>> >> > noted that moving a MP3 file from a CD to a HD takes a whole lot
>> >> > longer to do then say moving a file off of for example a CD of Linux
>> >> > stuff.
>>
>> Could be Linux doesn't handle FAT32 (is that what it is?) on a CD well.
>>
>> >> Maybe it's just a difference in block size between file systems?
>>
>> That would imply the blocksize on the destination filesystem is much bigger
>> than the blocksize on the CD, which is probably not the case. BTW, it's
>> FAT32 on the CD, right? What in the destination?
>>
>> > Maybe, I am still trying to figure it out.
>
> See a later post on this,
Ah, I was responding to a message from 13 Jan on 16 Jan; apparently the
mailserver is remiss in its duties. No other message in this thread has
arrived. I wonder how many others I'm not getting...
> I found out later on that audio CD's as such are not mountable.
Yup, no filesystem. So were those numbers some program's estimate of the
file sizes then? If not, what _were_ you mounting?
> Also saw somewhere that sometimes the process of moving them off of the
> audio cd to the HD may run them through the same set of processes short of
> actually playing them and that will cause inflation of the file size.
Well, AFAIK stuff's always stored as 16 bits/sample, 2 channels, 44100
samples/sec on a CD. There are several ways you could store them on disc;
most are no bigger than that, but you never know.
> I used K3b to rip the files off and they were transfered size for size, so
> I learned that copying them off, not good, ripping them off good...
I'll agree with that.
-- -eben QebWenE01R@vTerYizUonI.nOetP royalty.no-ip.org:81Drive nail here > < for new monitor. ----------------------------------------------------------------------- This list is provided as an unmoderated internet service by Networked Knowledge Systems (NKS). Views and opinions expressed in messages posted are those of the author and do not necessarily reflect the official policy or position of NKS or any of its employees.
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