linking devices

[Kozman Balint <qzy@mp.inf.elte.hu>]

Hi,

is there any way to link two (or more) block devices (ex: two hard disks)
into one logical block device? I need this to be able to copy a file of
70Gb to a machine which has two disks of 40 Gb. 

Thanks in advance.

Regards, 

   Balint