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SD card not storing

F

FuzMic

Member
Hi gurus

I have a 50G+ SD card (40% still free) which been working in a Samsung edge for years.
Recently I found I need a restart before I can write a file to it. And after restart then able to save file, however its data is corrupted.
Coping a mp3 file to it, even it appears, only part of it can be played.
Even after a while the file disappear from directory.

What is the probable cause? Could it be a bad contact. Or it need to be reformat. Or is there an app to check it?
 
50 GB is a weird capacity: they usually go 32GB, 64GB, 128GB, and it's only at the very highest capacities you get odd numbers like 400 GB.

But 40% of 50GB free sounds a lot like 30 GB used. And that's suspicious, because if that's really a 32GB card that's been hacked to show itself as higher capacity that's about the point where problems would start to show up. It may not be that, it might just be that the card is starting to fail (they do, and they can do suddenly), but it's a possibility.

I'd suggest backing up any data on the card right now, or anything you care about.

After that you can try testing the card to find out its real capacity. The definitive way is to use a computer (with a card reader - they are cheap if you don't have one) and a little utility called h2testw: that will attempt to fill the card with test data (which is why you need to back up first, as it will overwrite anything on there) and then read it back. If the card is lying about its capacity then you will get errors when it does the read test, and I think it will be able to estimate the real size.

But you should back up now anyway, because if the card is genuine but failing it could go abruptly, in which case you'll lose everything that's on there.
 
Thanks guys. Sure size is not 2G as old files up to about 32G working. It is stated in File Manager as 59.48GB with 38.88 used.
So not likely bad contact?
Since I can connect by cable to PC can it be tested your suggested app from PC.
 
Dannydet said:
It's a faulty card, toss it and get a new one
Click to expand...

This, after years in service that card is worn out as they are only good for a limited number of write cycles. So regardless of whether it was genuine or not it now needs to be replaced. You're fortunate if the contents can still be read so I'd suggest taking advantage of that and copying everything important on the card to a location of your choosing- PC, cloud, backup drive etc. then replacing it with a new card.
 
Guys being environmental conscious or plain frugal, i try to clean up the SD card's contact to give it a final try but ...

My Samsung had problem over a year of Start from Shut down (SfSD)" - black screen. Hence normally i only go into flight mode when i don't want any communications and do a restart occasionally. This is to avoid the hassle of trying to SfSD.

In a SfSD i have to press the power button and volume_down button a number of times, then hopefully the screen will fire up. But this time i tried over 10 times, still no luck. Any other way out,

During such SfSD the camera will take a shot, followed by blue light coming on. When done the phone can get ring in sound or notification sound eg from WhatsApp. The pressing power+VolDown, starts with the camera shot followed by a vibration. At this vibraton, if it ok, the screen will resurrect.
HELP guys.
 
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Restarted OK with VolUp-Power-Home, hold very long.

I wipe the contacts of SD Card but anything recorded after first look become gibberish. The card is a SanDisk 64G.
From China ITera SanDsik is < US10, very good buy.
 
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FuzMic said:
Restarted OK with VolUp-Power-Home, hold very long.

I wipe the contacts of SD Card but anything recorded after first look become gibberish. The card is a SanDisk 64G.
From China ITera SanDsik is < US10, very good buy.
Click to expand...

Not a good buy. Fake SDs and corrupted data can be very disappointing.

Recommend that you only buy SanDisk SDs from authorised dealers
 
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