@cool_jeeves As long as you use USB stick or external/portable SSD (such as Samsung T5 rated 5V 0.8A), it will stay under 5V 1A. The limit specified by Marantz is:
This unit can display a file structure with up to 8 levels, up to 1,000 folders and up to 2,000 files in 1 folder.
My recommendation is to use USB storage below 500 GB, otherwise SA-10 struggles (takes too long) when reading the folder structure after SA-10 input switched to iPod/USB.
Please also note that Windows 8 or 10 cannot format large USB storage as FAT32, need to use third party tools.
This unit can display a file structure with up to 8 levels, up to 1,000 folders and up to 2,000 files in 1 folder.
My recommendation is to use USB storage below 500 GB, otherwise SA-10 struggles (takes too long) when reading the folder structure after SA-10 input switched to iPod/USB.
Please also note that Windows 8 or 10 cannot format large USB storage as FAT32, need to use third party tools.