HDD speed: RPM and SATA/SCSI/SAS type - the most important factor
Disk Controller speed: SAS (6 Gbps/12 Gbps), SATA III (6Gbps), SATA II (3 Gbps), SATA I (1.5
Gbps)
Computer overall performance (CPU + RAM)
For most modern computers and disks (manufactured within the last 5-7 years) SATA III standard is supported, so erase speed is
limited by HDD throughput (disk write speed) only.
Our tests give the results: 10 GB per minute (in average) per pass with decent computer configuration and disks with age of up
to 5 years old.
For example, 2 TB Toshiba disk has been erased on Windows platform with one pass within 3 hours and 32 minutes, 14 TB Western
Digital disk - within 18 hours 53 minutes.
The following snapshots are real-test certificates for erasing of:
1) 2 TBToshiba (manufactured in 2015) SATA III (6 Gbps) 7200 rpm disk with One Pass Zeros showing the
average speed of 9 GB/min per pass
2) 14 TBWestern Digital (manufactured in 2019) SATA III (6 Gbps) 7200 rpm disk with One Pass Zeros
showing the
average speed of 12 GB/min per pass
