The
DISK_QUOTA_EXCEEDED error is experienced if the currently executing batch job operations exceed 1GB disk space limit. At any given time, an AdWords account can have up to 1GB of uploaded operations across all of its batch jobs that have not yet completed. You could check for the
diskUsageQuotaBalance which returns the disk quota balance of the batch job's customer in kB. You can check this balance and
cancel the batch jobs in the AWAITING_FILE or ACTIVE status and retry the request or you could wait until the size of pending operations falls below the limit before creating new jobs.