Multisession DVDs

Hi All,

A newbies question. I can create multi-session dvd+_r(w)s OK on my liteon LDW411S and can read them OK on this machine. However, when I take them to another machine I only see the data that was put on on the first session. This machine is running XP. Am I right in saying it is therefore dependant on the DVD reader as to whether or not the whole disk will be visible?
Also are DVD+RWs realiable? I had problems with CDRW in the past.