The Latitude E6440 has a better storage medium than most notebook PCs of a similar age and type to it. This portable PC has an SSD storage medium, whereas most medium processor core notebook PCs that were launched 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 notebook PCs of this age and spec.
The worst storage medium across comparable types of portable PC is HDD.
If the storage medium of this medium processor core notebook PC is not good enough for you then you might want to consider the T420s (SSD), or the X1 Carbon (SSD) both from Lenovo.