Upgrade Dell laptop hard disk

Upgrade Dell laptop hard disk I have a Dell laptop and I'm looking to upgrade to a bigger hard disk. Please can you explain to me how to identify which types of disk are compatible? I'm totally lost in a sea of variants of ATA/SATA/IDE. I've tried the Dell website and couldn't convince it to try and sell me an overpriced replacement. Here are some specs:
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Guest [Entry]

"You need an IDE/ATA hard drive. They are the same thing. If you can find a vendor selling 7200RPM 2.5"" IDE hard drives, you shouldn't have a problem with installing it.

You cannot put a SATA drive into that laptop according to the spec sheet."