Can I use multiple external USB hard drives? August 26, 2019 06:03 Updated ACS and A30 supports multiple external USB hard drives. All other models support only one USB hard drive. Related articles Can I use an external USB hard drive? SSD/HDD Recommendations & Installation Guide Setting up a NAS server shared folder for use with Aurender Conductor Are hard drive upgrades available? Will Aurender support MQA (Master Quality Authenticated)?