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150x SD card vs class 6 SDHC SD card - speed comparison.
zalek wrote:
On my PocketPC PDA I was using Transcend 150x 4gb SD card. Recently I replaced it by Transcend class 6 SDHC 8 gb card. My impression is that my old 150x card is faster that the new class 6 SDHC card. Is there any way to verify if my impression is true? Thanks, Zalek I suspect your observations are correct. 150X is pretty darn fast. To verify this, just clean up the 4GB card and download a BIG folder of pictures (3-4 GB)and time how long it takes to download the files. Repeat, downloading the same folder to the clean 8 GB card. Bob Williams |
#2
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150x SD card vs class 6 SDHC SD card - speed comparison.
"Bob Williams" wrote in message ... | zalek wrote: | On my PocketPC PDA I was using Transcend 150x 4gb SD card. Recently I | replaced it by Transcend class 6 SDHC 8 gb card. My impression is that | my old 150x card is faster that the new class 6 SDHC card. Is there | any way to verify if my impression is true? | | Thanks, | | Zalek | | I suspect your observations are correct. | 150X is pretty darn fast. | To verify this, just clean up the 4GB card and download a BIG folder of | pictures (3-4 GB)and time how long it takes to download the files. | Repeat, downloading the same folder to the clean 8 GB card. | Bob Williams http://www.flashmemorytoolkit.com/download.html the free prog asks for registration code each time it starts but you just hit 'try' and you're into the full kit small free and it'll write junk files to your card and read them back to give you good speed comparisons - don't forget to delete these files afterwards I had some *very* surprising results, which supports the many sites out there that state what manufacturers claim is often not quite true hop this helps Karl |
#3
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150x SD card vs class 6 SDHC SD card - speed comparison.
On Tue, 27 May 2008 17:31:38 +0800, "k"
wrote: http://www.flashmemorytoolkit.com/download.html the free prog asks for registration code each time it starts but you just hit 'try' and you're into the full kit small free and it'll write junk files to your card and read them back to give you good speed comparisons - don't forget to delete these files afterwards I had some *very* surprising results, which supports the many sites out there that state what manufacturers claim is often not quite true Many (most?) manufacturer claims are true but are "up to", maximum figures when the (nnn)X rating versus the more clearly defined SDHC Class (n) minimum rating. Flash Memory Toolkit is a handy program but it can't provide information used to decide the manufactuer claim is untrue. The manufacturer claim is based on an ideal environment and transfer, while many of the following can cause a lower rate: - Benchmark write access pattern - Inefficiencies or bottlenecks in the device using the card. - Inefficiencies or bottlenecks in the (PC USB) card reader. - Inefficiencies or bottlenecks in the PC USB itself. - Inefficiency in the filesystem - File sizes used for the test, or used in device operation Consider that many flash memory cards/USB drives/etc using current technology are rated around 30MB/s read speed, and yet many PCs can't get 30MB/s in some uses or tests, over USB, even if a much faster device like a good modern hard drive was connected via external enclosure instead of a flash drive. Clearly this means the bottleneck on a good spec'd flash drive is often elsewhere. |
#4
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150x SD card vs class 6 SDHC SD card - speed comparison.
"kony" wrote in message ... | On Tue, 27 May 2008 17:31:38 +0800, "k" | wrote: | Flash Memory Toolkit is a handy program but it can't provide | information used to decide the manufactuer claim is untrue. no it can't. the tests were run by companies and reviewers who ran both comparitive tests and who had access to far better test equipment than I however, using the same PCMCIA 5 in 1 card reader on an SCSI PC card slot, I have found some low end microSD card providing surprising comparivite speeds when also testing higher end SD cards Likewise with CF cards on an IDE cable | The manufacturer claim is based on an ideal environment and | transfer, while many of the following can cause a lower | rate: | | - Benchmark write access pattern formatted cards tend to get around thee worst limitations | - Inefficiencies or bottlenecks in the device using the | card. IDE is pretty good.. SCSI not bad either | - Inefficiencies or bottlenecks in the (PC USB) card reader. | - Inefficiencies or bottlenecks in the PC USB itself. I've skipped the USB parts.. though comparable results wer found using the inetrnal USB bus and an internal reader | | - Inefficiency in the filesystem | | - File sizes used for the test, or used in device operation of course - again though, comparitive speed tests are better than a poke in the eye | Consider that many flash memory cards/USB drives/etc using | current technology are rated around 30MB/s read speed, and | yet many PCs can't get 30MB/s in some uses or tests, over | USB, even if a much faster device like a good modern hard | drive was connected via external enclosure instead of a | flash drive. Clearly this means the bottleneck on a good | spec'd flash drive is often elsewhere. comparisons are pretty much the only useful tests a consumer can do k |
#5
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150x SD card vs class 6 SDHC SD card - speed comparison.
On Tue, 27 May 2008 17:31:38 +0800, "k" wrote:
"Bob Williams" wrote in message ... | zalek wrote: | On my PocketPC PDA I was using Transcend 150x 4gb SD card. Recently I | replaced it by Transcend class 6 SDHC 8 gb card. My impression is that | my old 150x card is faster that the new class 6 SDHC card. Is there | any way to verify if my impression is true? | | Thanks, | | Zalek | | I suspect your observations are correct. | 150X is pretty darn fast. | To verify this, just clean up the 4GB card and download a BIG folder of | pictures (3-4 GB)and time how long it takes to download the files. | Repeat, downloading the same folder to the clean 8 GB card. | Bob Williams http://www.flashmemorytoolkit.com/download.html the free prog asks for registration code each time it starts but you just hit 'try' and you're into the full kit small free and it'll write junk files to your card and read them back to give you good speed comparisons - don't forget to delete these files afterwards I had some *very* surprising results, which supports the many sites out there that state what manufacturers claim is often not quite true According to Galbraith, the apparent speed of a memory card depends a lot on the camera it is used in. Could be very fast on one device but slower on another, and one card could be faster or slower than another depending on the camera. http://www.robgalbraith.com/bins/mul...e.asp?cid=6007 Archibald |
#6
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150x SD card vs class 6 SDHC SD card - speed comparison.
"Archibald" wrote in message ... | On Tue, 27 May 2008 17:31:38 +0800, "k" wrote: | According to Galbraith, the apparent speed of a memory card depends a | lot on the camera it is used in. Could be very fast on one device but | slower on another, and one card could be faster or slower than another | depending on the camera. and in a pocket PC i'm sure its the same, however as I'm sure no camera owner cares which camera is fastest, rather they'd be more concerned which media is fastest for them, and a comparative speed would be more use than any raw figures say like for this, where the hardware is fixed and the media varies.. http://wiki.eeeuser.com/diskbenchmarks "Please note that numbers from different benchmarks are actually not comparable to each other! " |
#7
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150x SD card vs class 6 SDHC SD card - speed comparison.
On Wed, 28 May 2008 08:56:05 +0800, "k"
wrote: "Archibald" wrote in message .. . | On Tue, 27 May 2008 17:31:38 +0800, "k" wrote: | According to Galbraith, the apparent speed of a memory card depends a | lot on the camera it is used in. Could be very fast on one device but | slower on another, and one card could be faster or slower than another | depending on the camera. and in a pocket PC i'm sure its the same, however as I'm sure no camera owner cares which camera is fastest, You might feel you are sure but it is not so. Many (most?) cameras are slower than what are now dirt cheap flash cards if you don't need over 4-8GB (or higher in the future), so the speed of the camera is what determines how long one has to wait inbetween shots. Sometimes the camera has a reasonably sided buffer, so you can get a few shots off but not very many these days thanks to the ever growing resolutions (Unless one chooses lower res than the max their camera supports, which I for one never do choosing to resize later if I didn't need that res... which also makes for better, reduced granularity should some post process filtering be needed). ... rather they'd be more concerned which media is fastest for them, and a comparative speed would be more use than any raw figures Yes, that too is important. Remember that many people aren't reading from the camera, they'll take the card out and pop in a second empty one leaving the reading to another device... probably a USB card reader. say like for this, where the hardware is fixed and the media varies.. http://wiki.eeeuser.com/diskbenchmarks "Please note that numbers from different benchmarks are actually not comparable to each other! " That is useful, yet one person's goal is not always another's. If performance matters it's not just a matter of picking the memory but also the device reading and writing, especially when it is the more costly and time consuming item to replace if a bad choice was made. |
#8
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150x SD card vs class 6 SDHC SD card - speed comparison.
"kony" wrote in message ... | On Wed, 28 May 2008 08:56:05 +0800, "k" | wrote: | | | "Archibald" wrote in message | .. . | | On Tue, 27 May 2008 17:31:38 +0800, "k" wrote: | | | According to Galbraith, the apparent speed of a memory card depends a | | lot on the camera it is used in. Could be very fast on one device but | | slower on another, and one card could be faster or slower than another | | depending on the camera. | and in a pocket PC i'm sure its the same, however as I'm sure no camera | owner cares which camera is fastest, | You might feel you are sure but it is not so. Many (most?) | cameras are slower than what are now dirt cheap flash cards | if you don't need over 4-8GB (or higher in the future), so | the speed of the camera is what determines how long one has | to wait inbetween shots. Sometimes the camera has a | reasonably sided buffer, clipped I beg to differ but it *is* so. The point being that the camera is the non-variable in the equation, the memory card is the variable. The computer is the non variable, the pocketPC the non variable .. the card again is the variable that we're discussing. No one asked which bus is faster, which CPU gives the faster transfer - the original poster wanted to know (as per the subject line) how to do a speed comparison on an SD card - that's the variable. I have a pile of CF cards I do noty use in my cameras because the transfer speed is sooooo slooow (!) I know my camera will never be able to dump data at SCSI speeds but in the case of these cards, they are the bottleneck. I even speed tested them with the program I mentioned to get a *comparison* with my other cards and yes, they are appallingly slow. And in using the program I suggested I was very surprised to find a cheapy Chinese microSD card was a *lot* faster than my horribly expensive high speed CF cards. I was delighted to discover this, because although I wont use the microSD in a CF adapter in my camea for the resons you point out, I *will* use it in my pocketPC where the speed actually is noticable The original posted wanted to know "My impression is that my old 150x card is faster that the new class 6 SDHC card. Is there any way to verify if my impression is true?" the program I suggested would allow him to determine this (that card A is faster / slower than card B) me: | ... rather they'd be more concerned which | media is fastest for them, and a comparative speed would be more use than | any raw figures | Yes, that too is important. Remember that many people | aren't reading from the camera, they'll take the card out | and pop in a second empty one leaving the reading to another | device... probably a USB card reader. yes fortunately! Though I'm still astonished to discover how many people use the rotten bundled software and link via the camera. I work with photographers a lot, and I still find even pros that do this! to each other! " | | That is useful, yet one person's goal is not always | another's. If performance matters it's not just a matter of | picking the memory but also the device reading and writing, | especially when it is the more costly and time consuming | item to replace if a bad choice was made. of course you're right. but again if the original posted wanted a speed comparison in his particular working environment, there's not better way than to test it in his environment. benchtests are nice, but we are all really concerned with how it affects us in our own personal real world karl |
#9
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150x SD card vs class 6 SDHC SD card - speed comparison.
On Fri, 30 May 2008 09:14:53 +0800, "k"
wrote: | and in a pocket PC i'm sure its the same, however as I'm sure no camera | owner cares which camera is fastest, | You might feel you are sure but it is not so. Many (most?) | cameras are slower than what are now dirt cheap flash cards | if you don't need over 4-8GB (or higher in the future), so | the speed of the camera is what determines how long one has | to wait inbetween shots. Sometimes the camera has a | reasonably sided buffer, clipped I beg to differ but it *is* so. Only in a twisted argument. It is plainly obvious that people care whether they have to wait several seconds just to take another picture. The point being that the camera is the non-variable in the equation, the memory card is the variable. For the purposes of your argument, true. For the purposes of trying to isolate memory benchmarks if you refuse to pick a faster camera, also true. For the purposes of the whole point of this discussion, the reason why memory performance matters, it is false. Fastest memory on earth in a slow camera is maybe a little faster than mediocre memory, but the mediocre memory in a fast camera is faster still. I do get your point, but the reviews referenced previously were in the context of photography, the entire resultant performance and similarly so if performance really matters with any device because a buyer can choose what they buy, even if be the next camera since a flash card outlasts them all if only it's reasonbly fast and reasonable capacity. You'd have to be shooting a heck of a lot of pictures to fill up a 8GB flash card quickly for example, unless it's in raw mode. The computer is the non variable, the pocketPC the non variable .. the card again is the variable that we're discussing. Yes, and no. We can insist that it has to be the only variable in order for it to be a fair scientific test - absolutely, but at the same time too much emphasis being placed on small differences in performance are a waste of time, who pays a lot more for some exotic memory card if it ends up only being perhaps 20% faster? No one asked which bus is faster, which CPU gives the faster transfer - the original poster wanted to know (as per the subject line) how to do a speed comparison on an SD card - that's the variable. Agreed, but then the conversation drifted after that when there were comments pertaining to the camera/card combos. I have a pile of CF cards I do noty use in my cameras because the transfer speed is sooooo slooow (!) I know my camera will never be able to dump data at SCSI speeds but in the case of these cards, they are the bottleneck. I even speed tested them with the program I mentioned to get a *comparison* with my other cards and yes, they are appallingly slow. Ok, but we are speaking of modern cards now. It's quite easy to buy a card that's bottlenecked by the camera, and it's quite possible to have both the card and camera slowing things down, not just necessarily being solely the blame of one or the other. And in using the program I suggested I was very surprised to find a cheapy Chinese microSD card was a *lot* faster than my horribly expensive high speed CF cards. I was delighted to discover this, because although I wont use the microSD in a CF adapter in my camea for the resons you point out, I *will* use it in my pocketPC where the speed actually is noticable The original posted wanted to know "My impression is that my old 150x card is faster that the new class 6 SDHC card. Is there any way to verify if my impression is true?" the program I suggested would allow him to determine this (that card A is faster / slower than card B) Yes, and since you'd already written it, and I'd also written something similar, it had seemed we moved past this and onto new ground in the thread. The subtopic would then be that we can seen someone looking for the holy grail of flash card performance but they may reach a dead end if their device simply isn't capable of that. 150X that the OP saw was good, but even $10 USB thumbdrives are that fast these days let alone pro grade camera (marketed) cards. |
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