Question

I need to check in C# if a hard disk is SSD (Solid-state drive), no seek penalty?
I used:

    ManagementClass driveClass = new ManagementClass("Win32_DiskDrive");
    ManagementObjectCollection drives = driveClass.GetInstances(); 

But its only gives Strings that contain SSD in the properties, I can’t depend on that?

I Need a direct way to check that?

Answer 1

WMI will not be able to determine this easily. There is a solution here that’s based on the same algorithm Windows 7 uses to determine if a disk is SSD (more on the algorithm here: Windows 7 Enhancements for Solid-State Drives, page 8 and also here: Windows 7 Disk Defragmenter User Interface Overview): Tell whether SSD or not in C#

A quote from the MSDN blog:

Disk Defragmenter looks at the result of directly querying the device
through the ATA IDENTIFY DEVICE command. Defragmenter issues
IOCTL_ATA_PASS_THROUGH request and checks IDENTIFY_DEVICE_DATA
structure. If the NomimalMediaRotationRate is set to 1, this disk is
considered a SSD. The latest SSDs will respond to the command by
setting word 217 (which is used for reporting the nominal media
rotation rate to 1). The word 217 was introduced in 2007 in the
ATA8-ACS specification.