The ProBook 650 has an SSD storage medium which is better than most similar spec portable PCs that have been on the market for more than a year. Most laptops of this type and age 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 laptop's storage medium (SSD) is actually the best storage medium amongst all comparable spec laptops that are a similar age to the ProBook 650.
Amongst similar types of laptop the worst storage medium is HDD.
Other notebook PCs that have an SSD storage media currently available that you might want to look at include the Latitude 12 E7240[pl_2962186_price], or the Latitude 12 E7240[pl_2962186_price] both from DELL which has better reviews; or the XPS 13[pl_2705334_price], or the XPS 13[pl_2705334_price] both from DELL or the HP Elitebook 820 G2[plb_2886802_price] which is cheaper.
If the storage medium of this HP portable PC is not good enough for you then you might also want to consider the Toshiba Tecra Z40[plb_2891833_price] (SSD).