problems about partimage in knoppix

[Trace Green <green.trace@gmail.com>]

Hi,
When i use partimage in knoppix 3.6(kernel 2.4.27, partimage 0.6.4), the 
speed of backup is almost 6~7 times faster than knoppix 3.8.2(kernel 
2.6.11, partimage 0.6.4)

Does it because of 2.6.11kernel or others?

When i use partimage in knoppix 3.8.2, if i try no compress level and 
split image per 1G, sometimes, i can not restore these images,
error: Can read block 0 of image***, Does it because knoppix or partimage?

Any ideas? thanks very much!