There is a bug affecting the latest version of SteamCMD that is causing disk write failures across the board. This isn't an issue with AMP itself. We may have a workaround but we're hoping on a fix from the vendor.
SteamCMD - ERROR! Failed to install app 'xxxxxx' (Disk write failure)
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- Last Post 09 June 2021
Apparently the latest version of SteamCMD fixes this.
LeGeccio posted this 09 June 2021
Thank you! I still trying to fix this issue on my own for about 3 hours..