What type of memory does the Presario 6645DK use?

It uses DDR DIMM memory modules.

What storage drives fit the HP Presario 6645DK?

Compatible drive types: IDE / PATA 2.5" Drive.

Guaranteed-compatible SSD and hard-drive upgrades for the HP Presario 6645DK, matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the HP Presario 6645DK — matched to its drive bays and slots.

This option is out of stock.

The drive bay size is inferred from the system's reported storage interface.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.

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Guaranteed-compatible SSD and hard-drive upgrades for the HP Presario 6645DK, matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the HP Presario 6645DK — matched to its drive bays and slots.

This option is out of stock.

The drive bay size is inferred from the system's reported storage interface.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.