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Open a Command Prompt (Terminal) in the folder where your ISO and chdman.exe are located. Type the following to create the highest-quality CHD:

: Contains a vast alphabetical collection of verified PSP CHDs. PSP-CHD-ZSTD-Redump Part 2

The Ultimate Guide to PSP CHD Files on Internet Archive: Achieving Extra Quality Retro Gaming

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CHD files are frequently smaller than their CSO counterparts.