The Lenovo T430 has an SSD storage medium which is better than the HDD storage medium found on most medium processor core notebook PCs that came out more than two years ago. 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 notebook PC's storage medium (SSD) is actually the best storage medium amongst all portable PCs of a similar age and spec to the T430.
Amongst similar types of notebook PC the worst storage medium is HDD.
Portable PCs with a better storage medium that might be worth looking at include the T420s (£1,388.87) (SSD), or the S540 (SSD) both from Lenovo.