The Lenovo T440 has a better storage medium than most laptops of this age and type. This Lenovo laptop has an SSD storage medium, whereas most medium processor core notebook PCs that have been available for around the same time as 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 portable PC's storage medium (SSD) is in fact the best storage medium amongst all laptops of this age and type.
Amongst comparable types of portable PC the worst storage medium is HDD.