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#1
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SD card problems
I bought a SanDisk Ultra 64GB microSDXC card for my Moto X4 phone so I
could have music on it. I have a SIIG USB 2.0 Multi Card Reader/Writer that is several years old. The specs include: "Compliant with Universal Serial Bus 2.0 Specification, Support up to 64GB memory card capacity, Reads a variety of CF, xD, SD, SDHC, miniSD, microSD..." One issue I found is when I first started saving files to the card Windows 7 File Explorer reported that it was writing at 9.1MB/s, but I notice that the speed steadily drops. The next issue is that the card didn'preserve files beyond 7.16 GB, twice it corrupted the files and Windows prompted me to Scan and Fix the card when it was plugged into the card writer. Also the write speed can vary now from about 3MB/s to 1 MB/s. Does this sound like a bad card? It was only $15. Or could this be a bad SIIG USB card writer? I'm going to look around for a friend with a computer that has a built in SD slot to see if I can rule out the SIIG. |
#2
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SD card problems
On Thu, 23 Aug 2018 16:48:41 -0700, Mike S wrote:
I bought a SanDisk Ultra 64GB microSDXC card for my Moto X4 phone so I could have music on it. I have a SIIG USB 2.0 Multi Card Reader/Writer that is several years old. The specs include: "Compliant with Universal Serial Bus 2.0 Specification, Support up to 64GB memory card capacity, Reads a variety of CF, xD, SD, SDHC, miniSD, microSD..." One issue I found is when I first started saving files to the card Windows 7 File Explorer reported that it was writing at 9.1MB/s, but I notice that the speed steadily drops. The next issue is that the card didn'preserve files beyond 7.16 GB, twice it corrupted the files and Windows prompted me to Scan and Fix the card when it was plugged into the card writer. Also the write speed can vary now from about 3MB/s to 1 MB/s. Does this sound like a bad card? It was only $15. Or could this be a bad SIIG USB card writer? I'm going to look around for a friend with a computer that has a built in SD slot to see if I can rule out the SIIG. My old T500 Vista era laptop is much faster when using the built-in SD card reader - when compared with usb cable - - to the dash cam or digital camera .. - sorry - I'm not a techie to explain why .. or know if this helps. John T. |
#3
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SD card problems
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#5
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SD card problems
Mike S wrote:
SanDisk Ultra 64GB microSDXC https://www.sandisk.com/home/memory-...-microsd-48mbs They only list the read speed (48 MB/s), not the write speed. All they mention in the notes is "write speeds lower". Yeah, right, very vague. They lie about the read speed by not mentioning burst mode became available in USB 3.0 which your USB 2.0 controller doesn't support; see http://www.techdesignforums.com/prac...e/use-usb-3-0/. So you don't really know the read spec of that card when used with USB 2.0 and they say NOTHING about its write spec. Many users focus only on the capacity of the card, not its read and write speeds, so they end up with a slow card. You are saving files to the card which means you are writing to the card. https://www.pcmag.com/article2/0,2817,2393486,00.asp That author said he got 13.5 MB/s for write speed; however, he never mentioned the size of the files (to determine if they were under the burst mode size or larger) or if he use USB 2.0 or 3.0. https://www.tweaktown.com/reviews/67...iew/index.html That review is for the larger cards. However, note the change in read and write speeds under the different test modes. Tiny files don't fare as well for transfer speed on flash media. You didn't mention the size of your music files, or how many files you were writing at a time. https://crystalmark.info/en/software...k-main-window/ gives info on choosing number of test runs (for averaging their results), test size, and a short description of each test type. You did not mention how you were saving (writing) the files. Were you using Windows Explorer, some music library software, or what? Was the data bus quiescent, so the only data traffic was for the file copying? You mention "SIIG USB 2.0 Multi Card Reader/Writer" for the card reader but not its model number. I don't know if that comes with any software. I remember a USB HDD docking station that came with speed-up software that did just the opposite. Uninstalling the software got transfer speeds more consistently higher. I didn't see any software downloads at http://www.siig.com/download/search/...d=JU-MR0C12-S1 (if that is your USB card reader). You also did not mention if the card is formatting using FAT32, exFAT, or NTFS. Generally NTFS results in faster transfer than FAT32, plus NTFS doesn't have the 4GB max file size limit of FAT32. https://www.flexense.com/fat32_exfat...omparison.html exFAT beats NTFS for some tests; however, exFAT has no journaling to help protect files from corruption. You could go into Device Manager to look at the properties of the USB drive when it is plugged in and recognized. Check the Policies tab to see if Quick Removal is enabled (for safer handling of the drive) or if Better Performance is selected (which means you *must* safely eject the drive before physically disconnecting it; else, some data in the write cache won't get written to the drive, so you lose data and possibly corrupt the files). You never mentioned if you were safely ejecting (which is just a disconnect, not physical ejection) the card before removing it from the USB card reader or the USB card reader from your PC's USB port. You said you have a SIIG USB card reader. You did not mention if you are using that on a PC or with your Moto X4 phone (don't know if it could be used that way on the phone). I've not looked into USB transfer speeds on PCs versus smartphones. My cursory reading of some online articles has USB ports on smartphones being a lot slower than USB ports (of the same version, like 2.0 or 3.0 for both) on PCs. OTG (on-the-go) seems even slower. I only used an OTG drive once with my smartphone and found it slow (until it died and Samsung replaced it afterwhich I didn't rely on it anymore). Some phones have USB 3.0 ports while some still only have USB 2.0. I have the LG V20 whose specs say USB 2.0 but benchmarking by others shows it has USB 3.0 |
#6
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SD card problems
Mike S wrote:
On 8/23/2018 7:27 PM, Mike S wrote: On 8/23/2018 5:20 PM, wrote: On Thu, 23 Aug 2018 16:48:41 -0700, Mike S wrote: I bought a SanDisk Ultra 64GB microSDXC card for my Moto X4 phone so I could have music on it. I have a SIIG USB 2.0 Multi Card Reader/Writer that is several years old. The specs include: "Compliant with Universal Serial Bus 2.0 Specification, Support up to 64GB memory card capacity, Reads a variety of CF, xD, SD, SDHC, miniSD, microSD..." One issue I found is when I first started saving files to the card Windows 7 File Explorer reported that it was writing at 9.1MB/s, but I notice that the speed steadily drops. The next issue is that the card didn'preserve files beyond 7.16 GB, twice it corrupted the files and Windows prompted me to Scan and Fix the card when it was plugged into the card writer. Also the write speed can vary now from about 3MB/s to 1 MB/s. Does this sound like a bad card? It was only $15. Or could this be a bad SIIG USB card writer? I'm going to look around for a friend with a computer that has a built in SD slot to see if I can rule out the SIIG. My old T500 Vista era laptop is much faster when using the built-in SD card reader - when compared with usb cable - - to the dash cam or digital camera .. - sorry - I'm not a techie to explain why .. or know if this helps. John T. Thanks John, I got access to an HP w7 and am formatting the SD card now, I'll try writing the files with that, am guardedly optimistic after reading your post. Thanks. Mike I copied files from my desktop to a USB powered external hdd (22.5 MB/s) then copied from that to the SD card using an HP w7 laptop, the speed decreased steadily until it leveled off around 4 MB/s copying 26.4 GB 4,138 files, these were the copy speeds: 9.10 MB/s at start 5.04 MB/s at 50% 4.21 MB/s at 75% 3.93 MB/s at 99% When the copy operation was completed using dir /s *.mp3 the hard drive showed total files listed as 3532 files (28,369,825,845 bytes) while the SD card showed total files listed 1307 files (10,990,908,726 bytes) so I think I have a bad SD card. Is this kind of drop in write speeds for long write operations normal? If so, is it a function of heat, so doing multiple smaller writes then cooling the SD card might result in significant time savings? It's a Class 10 card, which means it's supposed to write at a minimum of 10MB/sec. 64GB is SDXC. 32GB is SDHC. What happens when you plug a SDXC capacity device into an SDHC controller ? Dunno. https://en.wikipedia.org/wiki/Secure_Digital If the product came from Ebay, anything is possible with regard to counterfeit. Paul |
#7
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SD card problems
On 24/08/2018 00:48, Mike S wrote:
I bought a SanDisk Ultra 64GB microSDXC card for my Moto X4 phone so I could have music on it. I have a SIIG USB 2.0 Multi Card Reader/Writer that is several years old. The specs include: "Compliant with Universal Serial Bus 2.0 Specification, Support up to 64GB memory card capacity, Reads a variety of CF, xD, SD, SDHC, miniSD, microSD..." One issue I found is when I first started saving files to the card Windows 7 File Explorer reported that it was writing at 9.1MB/s, but I notice that the speed steadily drops. The next issue is that the card didn'preserve files beyond 7.16 GB, twice it corrupted the files and Windows prompted me to Scan and Fix the card when it was plugged into the card writer. Also the write speed can vary now from about 3MB/s to 1 MB/s. Does this sound like a bad card? It was only $15. Or could this be a bad SIIG USB card writer? I'm going to look around for a friend with a computer that has a built in SD slot to see if I can rule out the SIIG. I Googled "SIIG USB 2.0 Multi Card Reader/Writer" and the top hit was their JU-MR0C12-S1 which I assume is their current model. The spec has a long list of supported formats but not microSDXC or SDXC. (CF, xD, SD, SDHC, miniSD, microSD (T-flash), MMC, RS-MMC, MS, MS Duo, MS Pro Duo, M2) As yours is several years old that might explain your lost or corrupted files. |
#8
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SD card problems
On 8/24/2018 1:24 AM, Paul wrote:
Mike S wrote: On 8/23/2018 7:27 PM, Mike S wrote: On 8/23/2018 5:20 PM, wrote: On Thu, 23 Aug 2018 16:48:41 -0700, Mike S wrote: I bought a SanDisk Ultra 64GB microSDXC card for my Moto X4 phone so I could have music on it. I have a SIIG USB 2.0 Multi Card Reader/Writer that is several years old. The specs include: "Compliant with Universal Serial Bus 2.0 Specification, Support up to 64GB memory card capacity, Reads a variety of CF, xD, SD, SDHC, miniSD, microSD..." One issue I found is when I first started saving files to the card Windows 7 File Explorer reported that it was writing at 9.1MB/s, but I notice that the speed steadily drops. The next issue is that the card didn'preserve files beyond 7.16 GB, twice it corrupted the files and Windows prompted me to Scan and Fix the card when it was plugged into the card writer. Also the write speed can vary now from about 3MB/s to 1 MB/s. Does this sound like a bad card? It was only $15. Or could this be a bad SIIG USB card writer? I'm going to look around for a friend with a computer that has a built in SD slot to see if I can rule out the SIIG. Â* My oldÂ* T500Â* Vista era Â* laptopÂ* is much faster when using the built-in SD card readerÂ* -Â* when compared withÂ* usb cable - - to theÂ* dash camÂ* orÂ* digital camera .. - sorry -Â* I'm not a techieÂ* to explain why .. or know if this helps. Â*Â* John T. Thanks John, I got access to an HP w7 and am formatting the SD card now, I'll try writing the files with that, am guardedly optimistic after reading your post. Thanks. Mike I copied files from my desktop to a USB powered external hdd (22.5 MB/s) then copied from that to the SD card using an HP w7 laptop, the speed decreased steadily until it leveled off around 4 MB/s copying 26.4 GB 4,138 files, these were the copy speeds: 9.10 MB/s at start 5.04 MB/s at 50% 4.21 MB/s at 75% 3.93 MB/s at 99% When the copy operation was completed using dir /s *.mp3 the hard drive showed total files listed as 3532 files (28,369,825,845 bytes) while the SD card showed total files listed 1307 files (10,990,908,726 bytes) so I think I have a bad SD card. Is this kind of drop in write speeds for long write operations normal? If so, is it a function of heat, so doing multiple smaller writes then cooling the SD card might result in significant time savings? It's a Class 10 card, which means it's supposed to write at a minimum of 10MB/sec. 64GB is SDXC. 32GB is SDHC. What happens when you plug a SDXC capacity device into an SDHC controller ? Dunno. https://en.wikipedia.org/wiki/Secure_Digital If the product came from Ebay, anything is possible with regard to counterfeit. Â*Â* Paul Is Amazon better? What do you recommend as far as reputable SD card sources? Thanks. |
#9
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SD card problems
On 8/23/2018 11:21 PM, VanguardLH wrote:
Mike S wrote: SanDisk Ultra 64GB microSDXC snip ... You didn't mention the size of your music files, or how many files you were writing at a time. (Dekstop) I opened 2 Windows 7 File Explorer windows, highlighted and copied all of the files from the music folder (in one window) from the hdd and pasted them into the window with the SIIG sd card writer. (Laptop) I used W7 File explorer in the same way when writing to the SD card inserted into an SD card slot built into an HP laptop. I don't know how many files are copied at the same time. The files are varying quality and lengths, I know this isn't very meaningful but they average 8 MB. You did not mention how you were saving (writing) the files. Were you using Windows Explorer, some music library software, or what? Was the data bus quiescent, so the only data traffic was for the file copying? You mention "SIIG USB 2.0 Multi Card Reader/Writer" for the card reader but not its model number. I don't know if that comes with any software. I remember a USB HDD docking station that came with speed-up software that did just the opposite. Uninstalling the software got transfer speeds more consistently higher. I didn't see any software downloads at http://www.siig.com/download/search/...d=JU-MR0C12-S1 (if that is your USB card reader). You also did not mention if the card is formatting using FAT32, exFAT, or NTFS. Generally NTFS results in faster transfer than FAT32, plus NTFS doesn't have the 4GB max file size limit of FAT32. https://www.flexense.com/fat32_exfat...omparison.html exFAT beats NTFS for some tests; however, exFAT has no journaling to help protect files from corruption. Great points, the only thing happening on the computer was the file copy operation, screen and hdd were set to always on in the power options, I used exFAT for the first 3 write attempts, and NTFS for the latest write attempt, as you said - it was faster, although there are still corrupt files/folders after the NTFS copy so I don't know if that skews the results. exFAT 9.10 MB/s at start --------- at 25% 5.04 MB/s at 50% 4.21 MB/s at 75% 3.93 MB/s at 99% NTFS 7.8 MB/s at start 7.2 MB/s at 25% 5.7 MB/s at 50% 5.2 MB/s at 75% 5.0 MB/s at 99% snip I was definitely safely ejecting the drive before removal each time. Thanks for the links and thoughts. Mike |
#10
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SD card problems
Did you yet try the CrystalDiskMark tool to see what it says for various
file sizes used in the different tests? If you get the same behavior on your friend's PC, I'd say try another $15 64GB SD card but perhaps something other than Sandisk. Team is another brand I'd stay away from. The Samsung EVO costs more but I've not had problems with them. Currently bestbuy.com is selling it at $25. walmart.com (and I mean Walmart, not a storefront for some other seller at walmart.com) has it for $20 where you can have it shipped free to a local store and should there be a problem you can return it to a store. https://www.walmart.com/ip/Samsung-6...pter/701252739 https://www.bestbuy.com/site/samsung...?skuId=5785404 Those might be sale prices, so swing by your friend's house soon to test your uSD card on his PC. Try CrystalDiskMark there, too. Just in case the USB card reader might be the problem, you can get a new uSD card with SD adapter and card reader for $20, like: https://www.newegg.com/Product/Produ...82E16820239984 (but thats Adorama Camera operating a storefront at Newegg) |
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