I am in the process of sourcing an external HD for my Mac to store and edit images using Lightroom and Photoshop.
I shoot with a Canon full-frame camera therefore, the raw image files are in the order of 30 to 40 MB in size depending on the ISO, and some of my PS PSD files are in the order of 500 to 900 MB in size depending on the number of layers.
I intend to edit photos directly form the external HD.
For cost reasons I am not going to purchase a SSD based external HD rather I am minded to purchase an external HD with enterprise class 7200 RPM drives.
My question is; whether the data transfer rates supported by the following interfaces technologies are sufficient to edit images directly on the external HD?
- USB 3.0
- Thunderbolt 3
Or put it another way what data transfer rates that I should look for in products to meet my demands?
Edit 1 The LR catalog and the PS scratch disk will be on the internal SSD.