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 Post subject: Flash Drive Becomes Read-Only
 Post Posted: Sat Aug 06, 2016 5:44 pm 
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Joined: Sun Feb 07, 2010 2:47 pm
Posts: 94
Hi Scott-

I just bought a 128Gb UltraPlus SanDisk microSD card. I haven't had it very long.

When I have copied a lot of files to it some of the files become read-only. I have tried reformatting the card. I can then copy some files to and from it. But when I try to copy a lot of files it aborts in the middle of the transfer.

Sometimes the files that it aborts with during the transfer become read-only and can't be deleted. Sometimes after the transfer abort the whole card becomes read-only.

I was reading on the internet that it could be that the card is wearing out.

I was able to format the card to exFat in Windows 7. Then I reformatted it to FAT32 under Ubuntu.

Could it be possible that I somehow damaged the card? What did I do to it and how can I make sure I don't do this again?


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 Post subject: Re: Flash Drive Becomes Read-Only
 Post Posted: Sat Aug 06, 2016 10:01 pm 
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Joined: Sun Feb 04, 2007 11:44 am
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I don't think it is likely you damaged the card, however it is very likely that the card is defective. In fact if you don't have similar problems with other cards I'd say that is almost certainly the case here. Scott.


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 Post subject: Re: Flash Drive Becomes Read-Only
 Post Posted: Sun Aug 07, 2016 11:55 am 
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I have had the same problem with many cards. All of them have been SanDisk cards. One card was exactly the same a 128Gb UltraPlus. In fact I have used up all my SanDisk cards, about $175 worth.

Can you provide a link to a card vendor that you think is reputable enough?


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 Post subject: Re: Flash Drive Becomes Read-Only
 Post Posted: Sun Aug 07, 2016 6:45 pm 
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Perhaps they aren't real SanDisk cards:

https://thecounterfeitreport.com/produc ... C-(microSD)-Memory-Cards.html

https://www.raymond.cc/blog/test-and-de ... h-h2testw/

Counterfeit flash cards have been a problem for many years now:
https://www.bunniestudios.com/blog/?p=918


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 Post subject: Re: Flash Drive Becomes Read-Only
 Post Posted: Sun Aug 21, 2016 12:15 pm 
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I just plugged in another flash card that was working well from my camera and now I can't read it. Is it at all possible it could be the flash card reader?

Is there a way to trouble shoot the reader? The reader has a serial number that is readable from a disk utility under Ubuntu linux: 121220130416.


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 Post subject: Re: Flash Drive Becomes Read-Only
 Post Posted: Sun Aug 21, 2016 2:03 pm 
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I believe it is possible for a bad reader to damage cards due to improper voltages or other problems. I would replace the reader if I suspected this. Scott.


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 Post subject: Re: Flash Drive Becomes Read-Only
 Post Posted: Sun Aug 21, 2016 5:37 pm 
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I really think it is the reader. I am able to read the card fine from the camera.

I still have the other bad cards. Could it possibly damage them to put them in the camera and try to use the camera to access them and save files?

Could it also possibly damage the camera to try to format the bad cards with the camera?

Also, could you post a link to a good reader?

I like the really small one-purpose microSD ones:

Attachment:
microSD_Card_Reader.png
microSD_Card_Reader.png [ 172.7 KiB | Viewed 889 times ]


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 Post subject: Re: Flash Drive Becomes Read-Only
 Post Posted: Sun Aug 21, 2016 10:12 pm 
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Quote:
I still have the other bad cards. Could it possibly damage them to put them in the camera and try to use the camera to access them and save files?

I wouldn't recommend putting cards in a camera unless I had any important files on them backed up first. I'm thinking more about saving the data than the camera or card.

Quote:
Could it also possibly damage the camera to try to format the bad cards with the camera?

I suppose anything is possible but I don't believe a bad card could damage a camera or reader unless it was completely shorted internally. Even then I suspect most cameras and/or readers have power protection circuitry, however I cannot vouch for all designs.

Quote:
Also, could you post a link to a good reader?

Unfortunately I don't have any recommendations since I haven't purchased a stand-alone reader in years, however some of the cards I've purchased have come with readers that seems to work fine. This is the reader (built-in to my ThinkPad) I normally use: <g>

Image


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