The Satellite W30Dt has an HDD storage media which is better than most notebook PCs that are a similar age to it. Most notebook PCs that were released around the same time as it have an SSD storage media. HDD is a traditional storage drive which stores the information on magnetic disks. HDD drives are slower than other forms of storage such as solid state drives (SSD) and flash drives.
This notebook PC's storage medium (HDD) is actually the worst storage medium across all notebook PCs of a similar spec and age to the Satellite W30Dt.
An SSD storage media is the best storage medium across similar types of notebook PC.
Portable PCs with a better storage medium that might be worth considering include the Toshiba U920t (SSD) which also has a higher rating.