How to Compute Drive Writes Per Day (DWPD)
Drive Writes Per Day (DWPD) calculations allow us to use the TBW specification of a drive to calculate the number of times the user capacity of a drive can be written per day over the warranty period (or a different number of years), based again upon the JEDEC workload used to specify the TBW.1
| Drive Writes Per Day = |
TBW of an SSD in TB * 1000 365 Days * Number of Years * SSD User Capacity in GB |
For a 1.8TB DC400 SSD with a 5-year limited warranty, the calculation would be
| Drive Writes Per Day = |
1432TB * 1000 365 Days * 5 * 1800GB |
= 0.43 or 43% of the drive capacity per day (that’s 774GB)
