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Why centos live cd so slow, and can not mount local HDD?

I have 2 question about Centos Live CD ( CentOS-5.5-i386-LiveCD-Release2.iso)
1. It's very slow to start

2. After boot by CD, I want to mount local HDD, but It has error:

 
mount: /dev/sda2 already mounted or /mnt/sda busy

How to resolve?
 
Thanh you!
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Distinguished Expert 2019
Commented:
use lvmdisplay
pvscan.

The partition /dev/sda2 is an LVM volume.
You need to use lvm tools to view the partitions within the LVM volume.
http://linuxdevcenter.com/pub/a/linux/2006/04/27/managing-disk-space-with-lvm.html
http://www.gagme.com/greg/linux/raid-lvm.php

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Commented:
Thank you
It already mounted !