Differences

This shows you the differences between two versions of the page.

--- photowiki:card [2023/01/07 15:20] – created ying
+++ photowiki:card [2023/10/09 15:36] (current) – ying
@@ Line 27: / Line 27: @@
       * SDXC: 64-128 GB and upto 2TB
   - Maximum Read/Writing speed: how fast it can quickly move in/out data
-    * category label based on max R/W speed: (MB/s)
+    * category label based on max R/W speed: (Mbps=mega bit per seconds, MBps = mega Byte per second = 8 Mbps)
+    * normal lower uhs-i and lower cards use mbps (bit) to make number looks bigger, each gen speed also different
+    * while higer uhs-i and uhs-ii card use MBps (Byte) as they are next gen card fast
       * R 280MB/s W 250MB/s : Video Pro
       * R 95MB/s W 90MB/s : Photo Pro
@@ Line 35: / Line 37: @@
       * R 48MB/s          : Average
       * below             : Low
+  - Example chart :
+    * for 4K video, 100mbps, = 12.8MBps
+    * for 4k video, 60mbps, = 7.5MBps
+    * for FHD video, 28mbps, = 3.5MBps
+    * so V30 card and 30MBps write is more than enough for common 4k video and below
+    * while 60MP high res sensor burst shots will require far more write speed than video.
+  * uhs-1 limit: 104MBps
+^ name                          ^ video rate ^ Read ^ Write ^ price (2023) |
+| SandDisk Extreme U3 UHS-I | V30 | 170MBps | 80MBps | 64GB = 13sgd |
+| SandDisk Extreme U3 UHS-I | V30 | 180MBps | 90MBps | 128GB = 27sgd |
+| SandDisk Extreme U3 UHS-I | V30 | 180MBps | 130MBps | 256GB = ?sgd |
+| SandDisk Extreme Pro U3 UHS-I | V30 | 170MBps | 90MBps | 64GB = 15sgd |
+| SandDisk Extreme Pro U3 UHS-I | V30 | 200MBps | 90MBps | 64GB = 18sgd-19.5 |
+| SandDisk Extreme Pro U3 UHS-I | V30 | 200MBps | 90MBps | 128GB = 32sgd-35 |
+| SandDisk Extreme Pro U3 UHS-I | V30 | 200MBps | 140MBps | 256GB = 55sgd-72 |
+| SandDisk Extreme Pro U3 UHS-I | V30 | 200MBps | 140MBps | 512GB = 125sgd-139 |
+^-^
+^-^
+| Sandisk Extreme Pro SDXC, UHS-II, 64GB | ? | 280MBps | 250MBps | 64GB |
+| Sony E 64GB UHS-II | V30 | 270MBps | 70MBps | 64GB=25sgd |
+| Sony E 128GB UHS-II | V60 | 270MBps | 100MBps | 128GB=60sgd |
+| Sony M 64GB UHS-II | V60 | 277MBps | 150MBps | 64GB=35sgd |
+| Sony M 128GB UHS-II | V60 | 277MBps | 150MBps | 128GB=92sgd |
+| Sony M 64GB UHS-II Tough | V60 | 277MBps | 150MBps | 64GB=63sgd |
+| Sony M 128GB UHS-II Tough | V60 | 277MBps | 150MBps | 128GB=99sgd |
+| Sony G 64GB UHS-II Tough (for 8K) | V90 | 300MBps | 299MBps | 64GB=138sgd |
+| Sony CFexpress 128GB tough | ? | 1700MBps | 1480 MBps | 128GB=306sgd |
   - Minimum video recording performance: how fast it can steadily record video
     * category label based on Minimum write speed (MB/s) and its corresponding Bus Mode (old to new):
@@ Line 51: / Line 84: @@
       * UHS-II bus: 150MB/s - 300MB/s
+  * ref:
+    * camera support uhs-ii:
+      * https://www.memorycard.expert/-Article/UHS-II-Cameras