The HP mt40 has an SSD storage medium which is better than the HDD storage medium found on most medium processor core notebook PCs that are a similar age to it. 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 in fact the best storage medium amongst all medium processor core notebook PCs that are a similar age to the mt40.
Amongst similar types of portable PC the worst storage medium is HDD.
If the storage medium of this HP notebook PC is too bad for you then you might want to consider the T420s (£1,388.87) (SSD), or the S540 (SSD) both from Lenovo.