Edited by 12458 at Jan 28, 2016 20:22 |
My question is can the faster speed be used?
I guess not as the guitar has no 1.8v operation
UHS-ISpecified in SD version 3.01, supports a clock frequency of 100 MHz (a quadrupling of the original "Default Speed"), which in four-bit transfer mode could transfer 50 MB/s (SDR50). UHS-I cards declared as UHS104 (SDR104) also support a clock frequency of 208 MHz, which could transfer 104 MB/s. Double data rate operation at 50 MHz (DDR50) is also specified in Version 3.01, and is mandatory for microSDHC and microSDXC cards labeled as UHS-I. In this mode, four bits are transferred when the clock signal rises and another four bits when it falls, transferring an entire byte on each full clock cycle.
Specified in version 4.0, further raises the data transfer rate to a theoretical maximum of 156 MB/s (half duplex) or 312 MB/s (full duplex) using an additional row of pins (a total of 17 pins for full-size and 16 pins for micro-size cards).
Cards that comply with UHS show Roman numerals 'I' or 'II' next to the SD card logo, and report this capability to the host device. Use of UHS-I requires that the host device command the card to drop from 3.3-volt to 1.8-volt operation and select the four-bit transfer mode, while UHS-II requires 0.4-volt operation.