The Tecra Z50 has an SSD storage medium which is better than most portable PCs that were launched more than two years ago. Most medium processor core notebook PCs that have been on the market for a comparable 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.
This laptop's storage medium (SSD) is actually the best storage medium amongst all medium processor core notebook PCs that have been available for a comparable time to the Tecra Z50.
Amongst similar types of laptop the worst storage medium is HDD.
If the storage medium of this medium processor core notebook PC is not good enough for you then you might want to look at the T420s (£1,388.87) (SSD), or the S540 (SSD) both from Lenovo.