What Format Does Photoshop Use Scratch Disk Use

Learn how to set upward and manage scratch disks in Photoshop.

What is a scratch disk?

A scratch deejay is a hard disk bulldoze or SSD used for temporary storage while Photoshop is running. Photoshop uses this space to store portions of your documents and their history panel states that don't fit in the retentivity or RAM of your motorcar.

By default, Photoshop uses the hard drive on which the operating organization is installed as the primary scratch disk.

If yous meet a 'Scratch disk total' error, information technology often means that your hard drive (or drives) used every bit scratch disk is (are) running out of storage infinite required to perform a chore.

How to set your scratch disk preferences

You can tweak scratch disk settings in thePreferences > Scratch Disks department.

ChooseEdit > Preferences > Scratch Disks (Win) orPhotoshop > Preferences > Scratch Disks (Mac).

In the Preferences dialog, select or deselect the agile check box to enable or disable a scratch disk. To modify the scratch disk club, click the arrow buttons.

Click OK. To apply the changes, restart Photoshop.

If Photoshop 2019, or before, cannot launch because the scratch disk is total, concur downward the Cmd + Option keys (macOS) or Ctrl + Alt keys (Windows) during launch to prepare a new scratch disk.

Specify appropriate bulldoze for scratch disk

How much scratch deejay space do you lot need?

Minimum complimentary space on a scratch disk should exist 6 GB for Photoshop desktop. All the same, this is the minimum infinite that Photoshop tries to keep costless in the scratch deejay, and the available infinite that Photoshop considers in a scratch disk is the vi GB subtracted from the electric current free space in the disk. So, if the free space in your scratch disk is 10 GB, available space that Photoshop will consider in the scratch disk is 10 - half-dozen = 4 GB, which may/may not be enough for the electric current performance being performed.

• If y'all make small changes only, you lot demand a minimum of 10 GB scratch disk space for Photoshop (with default preferences, brushes, patterns, etc). Information technology is recommended to have minimum 20 GB of gratuitous infinite on your OS hard bulldoze while working with Photoshop. Boosted free space may exist required based on the file type you're working with.
  
• If y'all make big changes to dense pixel layers (that is, using several filters on complex groundwork images or many edits to large smart objects) you could demand every bit many times the size of the original file as there are history states.

Supported bulldoze formats for scratch disks

macOS:APFS or Mac Bone Extended (Journaled)

Windows: NTFS, exFAT, FAT32

Drives not recommended for scratch deejay

• Thumb drives
  
• Any USB-2 drive
• NTFS formatted drives on macOS

Recommended settings for scratch disks

• For best performance, connect the scratch disks to a compatible port that has the highest bandwidth limit of all the available ports. The bandwidth limits for diverse ports are every bit follows:
  Thunderbolt = 10GB/sec
  eSATA = 600MB/sec
  PCIe = 500MB/sec
  USB3 = 400MB/sec
• To better performance, set the scratch disk to a defragmented difficult deejay that has plenty of unused space and fast read/write speeds. If yous take more 1 hard drive, you can specify additional scratch disks. Photoshop supports up to 64 exabytes of scratch disk space on up to four volumes. (An exabyte equals 1 billion GB.)
  
• If your startup deejay is a hard disk, as opposed to a solid-country disk (SSD), try using a different hard disk for your primary scratch deejay. An SSD, on the other mitt, performs well equally both the primary startup and scratch disk. In fact, using an SSD is probably ameliorate than using a separate hd equally your main scratch disk.
• Scratch disks should be on a different drive than any large files y'all are editing.
• Scratch disks should be on a dissimilar drive than the 1 your operating system uses for virtual retentiveness.
• RAID disks/disk arrays are good choices for defended scratch disk volumes.
• Defragment drives with scratch disks regularly.

Source: https://helpx.adobe.com/photoshop/using/scratch-disks-preferences.html

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