The options you've provided (3 GHz, 1 GHz, 2 GHz, 4 GHz) seem to refer to processor speeds (measured in gigahertz, GHz) rather than disk space (typically measured in gigabytes, GB). To determine how much disk space Desdemona needs to load Photoshop, we would need information about the disk space requirements of the software.
As of my knowledge cutoff in October 2023, Adobe Photoshop typically requires a minimum of about 4 GB of available hard disk space for installation, but this can vary based on the version and any additional features or content. Therefore, you might need at least that much space on the hard drive to successfully install the program.
If you can clarify or provide the correct options referring to storage capacity (like GB), I would be happy to help further!