The Toshiba Tecra Z40 has a better storage medium than most laptops that were launched around the same time as it. This notebook PC has an SSD storage medium, whereas most comparable spec notebook PCs that are a similar age 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.
An SSD storage medium is actually the best storage medium across all notebook PCs that have been available for more than two years.
The worst storage medium across similar types of portable PC is HDD.
Laptops with a better storage medium that might also be worth looking at include the T420s (£1,388.87) (SSD), or the S540 (SSD) both from Lenovo.