@Goldy
The important rating is consistent write speed and the 12mb/sec you mention may only be peak.
You could try copying a large file to the drive using a computer and see if it writes consistently or in bursts – if it is only writing at a high speed in short bursts the drive is probably not suitable for the consistent write speeds required for multitrack recording.
As noted in the reference guide –
“Not all USB devices are capable of the high bandwidth used by the SQ-Drive multitrack
recording feature. For best results when multitrack recording direct to USB, use a high-
speed external hard drive rather than a USB stick/’pen’ drive.”
(the following list with information kindly provided by the community here may be useful too – https://www.allen-heath.com/usbdevicelist )
Thanks,
Keith.