The Acer Travelmate TMP645-S has an SSD storage medium which is better than most portable PCs of a similar age and spec to it. Most laptops of this age and type have an HDD storage medium. Solid State Drives (SSD) store data in semiconductors on a circuit board rather than using magnetic or optical media. Solid State Drives have no moving parts which makes them very fast and reliable.
This portable PC's storage medium (SSD) is actually the best storage medium amongst all laptops that have been available for around the same time as the Travelmate TMP645-S.
The worst storage medium across comparable types of portable PC is HDD.
We compared all the other notebook PCs that have an SSD storage media to this portable PC and we think because of it's better review score, the ProBook 650 G1, and the ProBook 650 G1 both from HP or the Lenovo L450 is also worth considering.
Portable PCs with a better storage medium that might also be worth considering include the LG 13Z940 (SSD).