What is the relation between "?00X" & "??MB/s"?
Trying to figure out how fast a 400X memory card is and what cards to buy in the future.
Thank you
Nov 25, 2012 14:23 | #1 What is the relation between "?00X" & "??MB/s"?
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Jon Cream of the Crop  69,628 posts Likes: 227 Joined Jun 2004 Location: Bethesda, MD USA More info | Nov 25, 2012 15:25 | #2 1x = 150 KB/sec (the data transfer rate of the original CD-ROM drives). Be aware that most card makers base their speed ratings on the card's read speed, while the better brands, like SanDisk, base their speeds on the (slower, but more important) write speed. Jon
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PryorKnowledge Member 98 posts Joined Oct 2009 More info | Nov 25, 2012 15:48 | #3 Finally going to upgrade from my junk Class 2 SDHC cards. Never gave much thought to read/write speed until recently when I was shooting RAW bursts and was forced to wait for each individual image to load
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msowsun "approx 8mm"  More info | Nov 25, 2012 19:56 | #4 JJD.Photography wrote in post #15287534  What is the relation between "?00X" & "??MB/s"? Trying to figure out how fast a 400X memory card is and what cards to buy in the future. 133x = 20MB/s Speed CompactFlash IDE (ATA) emulation speed is usually specified in "x" ratings, e.g. 8x, 20x, 133x. This is the same system used for CD-ROMs and indicates the maximum transfer rate in the form of a multiplier based on the original audio CD data transfer rate, which is 150 kByte/s. , kByte/s where R = transfer rate, K = speed rating. For example, 133x rating means transfer speed of: 133 * 150 kByte/s = 19,950 kByte/s ~ 20 MB/s. These are manufacturer speed ratings. Actual transfer speed may be higher, or lower, than shown on the card[17] depending on several factors. The speed rating quoted is almost always the read speed, while write speed is often slower. Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.4 USM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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joeblack2022 Goldmember 3,005 posts Likes: 5 Joined Sep 2011 Location: The Great White North More info | Nov 25, 2012 20:11 | #5 PryorKnowledge wrote in post #15287861 Finally going to upgrade from my junk Class 2 SDHC cards. Never gave much thought to read/write speed until recently when I was shooting RAW bursts and was forced to wait for each individual image to load What camera are you shooting with? This has more to do with the buffer than the actual speed of the memory card, though faster cards will clear the buffer quicker up to the max speed supported by the camera. Joel
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OverSpun Member 192 posts Joined Sep 2004 Location: Southern California More info | I'm only joining the discussion- Gripped 5D3 | 17-40L, 50mm f/1.8II, 85mm f/1.8, 35-105, 100-400L IS
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PryorKnowledge Member 98 posts Joined Oct 2009 More info | Nov 26, 2012 17:17 | #7 joeblack2022 wrote in post #15288879 What camera are you shooting with? This has more to do with the buffer than the actual speed of the memory card, though faster cards will clear the buffer quicker up to the max speed supported by the camera. 60D. Noticed issues when shooting bursts, especially RAW
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