I have a two year old Dell Dimension 4100, Pentium 3, 1 GHz. I would like to replace the Sony CD R/W SC148C drive unit with a LG DVD R/W GSA 4160B drive, relegating the Sony drive to a slave position. The specification for the LG drive recommends use of a Pentium 4, 2.4GHz or better. What will happen if I buy and install the LG unit? Will it work, work at less than half speed? Are there any other hidden incompatibilities? I am not interested at this stage to download and record films and videos, only data storage. I realise the ideal is to purchase a new computer but a state pension puts this out of the question for a long, long time as there are other priorities. Being a elderly newby to computing I ask for your assistance. Thanking you all in anticipation of your replies.