The ProBook 450 has a better storage medium than most medium processor core notebook PCs that have been available for around the same time as it. This laptop has an SSD storage medium, whereas most medium processor core notebook PCs that have been on the market for a similar time to it 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.
An SSD storage medium is in fact the best storage medium across all portable PCs of a comparable age and spec to the ProBook 450.
The worst storage medium amongst similar types of laptop is HDD.
Other notebook PCs that have an SSD storage media currently available that you might also want to look at include a cheaper laptop such as the T450[pl_2899072_price], or the T450[pl_2899072_price] both from Lenovo or you might consider a higher rated laptop such as the Asus UX301LA[plb_3012206_price].
If the storage medium of this medium processor core notebook PC is not good enough for you then you might also want to consider the DELL Latitude 15 E5550[plb_2701391_price] (SSD).