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1. Re: Which disk fro Scartch Disk?
JJMack Dec 22, 2013 10:50 AM (in response to Heirloom Bob)Your SSD first then one of your disk.
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2. Re: Which disk fro Scartch Disk?
Heirloom Bob Dec 22, 2013 11:11 AM (in response to JJMack)Thanks JJMack. I thought it should be one other than where the program was installed but it would not allow one of the other HDD unless I also selected the SSD.
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3. Re: Which disk fro Scartch Disk?
JJMack Dec 23, 2013 6:17 AM (in response to Heirloom Bob)You want it to operate as fast as possible so you put it on your fastest device. It can be anywhere and depending on how many history states, cache levels, document size, number of this and that etc 128GB my be exceeded at times so you give a second device for safety.
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4. Re: Which disk fro Scartch Disk?
station_two Dec 22, 2013 1:05 PM (in response to Heirloom Bob)What JJMack says.
The rule of thumb I follow to figure out scratch space says to figure on 50 to 100 times the size of your largest file ever multiplied by the number of files you have open. I have seen the scratch file exceed 800 GB once, an admittedly rare occurrence, but it often exceeds 200 GB when stitching large panoramas and the like.
As an example—and stressing that I'm aware that others have even more scratch space than I do—I keep two dedicated, physically separate hard drives as my primary and secondary Photoshop scratch disks and a lot of GB free on my boot drive for the OS. I also have 16 GB of RAM installed.
Additionally, if you only have a single HD, i.e. your boot drive, you'd need it to be large enough to accommodate both the swap files of the OS as well as Photoshop's scratch.
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5. Re: Which disk fro Scartch Disk?
Trevor.Dennis Dec 22, 2013 1:20 PM (in response to station_two)What I have done through multiple hardware upgrades over the years, is to bump the previous system's boot drive into use as dedicated Scratch disk. So it is currently a 1st gen Velociraptor. I have a spare 2nd gen V'raptor that I ought to swap out, but it is one of a pair from a failed raid0, (I got two new drives rather than take a chance).
But we had a discussion a month or so back, about using a dedicated SSD for Scratch, and they are pretty affordable nowadays. I have 32Gb RAM, but here's the thing... I have not worked on any really big files recently, but I noticed a surprisingly large scratch file last week. I did have a few image docs open though, so it seems it is always a good idea to have a good Scratch drive strategy.


