What is DDR200 & 225 memory card?
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Author：Tech-Top
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Date time：2025-10-21
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R1018E: USB AM to CF(Adapter) + CM 5Gbps to SD4.0 + Micro SD4.0 Dual-LUN Card Reader
Upstream Port: 1 x USB 3.2 5Gbps Type A/C Male
Downstream Port:
1 x SD4.0 Card Slot,
1 x Micro SD4.0 Card Slot
Performance: Max 5Gbps, SD4.0 up to 300MB/s, 2TB Capacity
LED: White (Solid: Online)
Power: USB - Powered
Compatibility: Win7/8/8.1/10, Mac OS, iPad OS, Linux, Android, SD4.0, MicroSD
Physical: 55 x 35 x 13mm, Space Grey + Black (Aluminum)
Regarding SD card speeds, UHS-I has two modes:
SDR (Single Data Rate) mode samples once per clock cycle (read or write), transmitting 4 bits per cycle, with max speed half the bus frequency (104MB/s).
DDR (Double Data Rate) mode reads/writes twice per cycle, transmitting 8 bits.
Samsung PRO Ultimate SD uses DDR225 mode, with theoretical max clock 225MHz and bus speed 225MB/s, key to its 200MB/s read speed.
