should i set photoshops scratch disk to my external HD

[stangeroo]

since its USB

 

[TheMajor]

internal HD's are more powerful (mostly)
You can try it...set one scrath disk to internal and one to ur USB drive and see what happens

 

[ekÆsine]

No, do not use an external drive for your photoshop scratch disk. Photoshop would run like a dog.

 

[jcline]

Do you have multiple partitions? If so, I would set the scratch disk to one of the non-system partitions...

 

[stangeroo]

no, I have the C partition, then the D partition that is just the system recovery