the hdd is located on the left side of the system, it were you insert your pc cards, bellow that you will find 2 screws that are holding it, unscrew them and slid it out, do the same thing to insert the drive that you got.

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Inspiron 6000 1.5 CM XP Pro 512 mb 40GB DVDRW drive
Inspiron 300m 1.2 P4 Win 2000 256mb 30 GB CDRW drive

Hi,

It may be worth adding, that there is an adapter on the back of the drive you will have to change over. It will pull off. Look at both together and you will see the difference.

                                                                           Regards Chris