microSD XC painfully slow write-speed

G

gunzb

New Member
Hi, I've just bought a microSD XC 64GB Samsung Evo from ebay, but there's a problem:

When I first plugged it in and started writing files on it, it did so at an average speed of 8 mb/s... then when the card had 5gb of data in it, the speed dramatically decreased at roughly 1 mb/s.

So I tried formatting it with SDFormatter, but afterwards it did the exact same thing.

Can someone help me with this? Thanks :)
 
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I don't know exactly what that means or how to ascertain it but on the msd, next to SD XC is written "I" and above that 1 in a semicircle
 
It could be the card reader that is restricting the transfer rate, is it a laptop you are using or an external card reader etc
 
I'm transferring mp3s mostly (3-10 MBs), but the same happens if I try to transfer bigger files (90-100 MBs).

I downloaded Diskmark, and I ran it but it's been stuck on the "Preparing..." stage for 2 minutes. If it manages to get past it, I'll edit the post.
 
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It appears to be stuck. (I already closed it and ran it again but nothing happens).

EDIT I also tried the non-shizuku version... nothing.
 
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The preparing heading should stay, but section next to it should change as it progresses to sequential read, sequential write etc.

Try running it on your main drive in case it`s a problem with the card
 
Yes, I ran it on my C: drive and it worked as you say. With my microSD it remains at Preparing... stage.
 
This one worked :

Copy File Bench started...

Copy D:\ciao.mp3 to P:\ciao.mp3
Size: 14592461
Time: 16255 ms
Transfer Rate: 0,856 MB/s

Copy File Bench ended
 
Seems not bad, but kind of hard to tell with 1 small file, try doing larger amount like 1GB

Also if you want to try crystal disk mark again, it could have been the test size was to large for a memory card, try lowering it from default 500MB to the lowest 50MB
 
Crystall Mark worked using a 50MB test size even though it seems to be stuck at random write 4KB [1/5], but maybe what I got is enough.

http://postimg.org/image/70zd4s8nd/

70zd4s8nd


EDIT By clicking stop, the program remains in Random Write and cannot be closed. If I close it through the Control Panel, do I risk ruining the msd?
 
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I downloaded it, but on Crystall Mark by clicking stop, the program remains in Random Write and cannot be closed. If I force-close it through the Control Panel, do I risk ruining the msd?
 
That's what I meant, I was afraid of ruining the msd by doing so. But apparently there's no risk so I did it.

These are the results obtained while Crystall was still opened.

http://postimg.org/image/axunnn38d/

http://s23.postimg.org/5r35f9nej/hdt2.jpg


EDIT I managed to close Crystall in the Task Manager, but the process is still going and can't be closed (It says "access denied", maybe because I ran it as Administrator) and the test gives the same results.
 
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