The HP mt40 has an SSD storage medium which is better than the HDD storage medium found on most similar spec notebook PCs that have been around for around the same time as 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.
An SSD storage medium is actually the best storage medium across all medium processor core laptops that came out around the same time as the mt40.
Across similar types of notebook PC the worst storage medium is HDD.
If you would prefer a laptop with a better storage medium then you might also want to look at the DELL XPS 13 (£1,199.99) (SSD).