Hi, I would like to know if a branded pc such as HP pavilion 6405 can be upgraded hard diskwise
Possibly, but not directly. It is of a vintage (and a cheapness) that probably will not support hard disks larger than 8.4 GB unless you can find a third-party BIOS upgrade or add-in a PCI IDE controller card with its own BIOS to boot from (about $30).
TallCool1
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