TC58NC6623 is Toshiba's branding for the SSS6698-BA controller.
In the world of flash drive repair, this combination is notorious. It represents a partnership between Toshiba (now Kioxia) flash memory (TC58NC6623) and a Solid State Storage Technology Corporation (SSS) controller (SSS6698-BA). To bring this drive back to life, you need one specific software tool: the (Mass Production Tool). tc58nc6623 sss6698-ba mptool
Once you successfully run the MPTool, to a cloud drive (Google Drive / Mega). Label it exactly: SSS6698-BA_TC58NC6623_Working_YYYY-MM-DD . it may see the drive
If you search for generic SSS6698-BA MP Tool V2.123 , it may see the drive, but during the "Pretest" phase, it will throw: but during the "Pretest" phase