Apollo23 SDHC SD MMC to 3.5" 40 Pin IDE Hard Disk Drive HDD SSD Male Adapter Converts Secure Digital Card into IDE compatible hard drives. 4-pin computer power supply connector. You can install the OS onto the SD Card. Compatible with MMC system specification 2.0 , SD Memory Card specification 1.0, SDHC Memory Card. Support PIO, Multi-Word DMA and Ultra DMA data transfer mode.