The Tecra Z50 has an SSD storage medium which is better than the HDD storage medium found on most medium processor core notebook PCs that are a comparable 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.
An SSD storage medium is in fact the best storage medium amongst all comparable spec portable PCs that were launched more than two years ago.
Amongst similar types of notebook PC the worst storage medium is HDD.
If the storage medium of this portable PC is too bad for you then you might also want to look at the T420s[pl_48433_price] (SSD), or the S540[pl_2433540_price] (SSD) both from Lenovo.