Well there's a few different brands on that sales site, but yours originally came with:
One 30 GB and above E-IDE hard disk (2.5”, 9.5mm, UltraDMA-100)
So search for that type of thing
Wow it came with an 80Gig: http://sdd.toshiba.com/main.aspx?Path=StorageSolutions/2.5-inchHardDiskDrives/MK8025GAS
OK so now you have:To be absolutely certain on what it will take you can check your warranty on what originally came with here: http://secure3.tx.acer.com/FindSystem/FindSystem.aspx?title=Information
- 9.5mm High
- ATA-6 Interface
- 100 Mb/sec Transfer Rate
Or you can read your manual here: ftp://ftp.support.acer-euro.com/notebook/aspire_1680/manual/as1680-uk.pdf
Which states: E-IDE hard disk (2.5”, 9.5mm, UltraDMA-100)
No problems.
It took me a little while to confirm that myself