N9 : Slow USB speed
 

Hello Everyone,

Since a while my 16GB N9 has a USB transfer rate of 3-4MB/S, in the same conditions my 64 has a transfer rate of 20MB/S... Do you know what could cause that ?

Thank you,

Re: N9 : Slow USB speed
 

check your USB cable, whether you have a slow usb1.1 printer or any such device connected to your pc at the same time as your transfer. Also are you transferring using mass storage or sync and connect. At time of you have hundreds of small files being transferred the speed gets bogged down too...

Re: N9 : Slow USB speed
 

Well, my 64GB gives me 20MB/S on the same kind of life on the same cable... So I'm pretty sure it can't come from the cable/pc...

Re: N9 : Slow USB speed
 

I reformatted the partition using FAT32 and 4096 octets in block size and everything is fine now :)

Re: N9 : Slow USB speed
 

I used to think a write transfer-speed of around 3-4MB/s is normal (16GB version). How did you do the reformating?

Connect the phone using mass-storage mode and reformat the partition like any other partition/drive?

Re: N9 : Slow USB speed
 

Yes. usb-storage exposes the whole block device, so you can partition and format.

This is also the reason the phone cannot access the filesystem while in USB storage mode, because it cannot mount a filesystem locally and over USB at the same time

Re: N9 : Slow USB speed
 

Going FAT32 w/ 4096 cluster size indeed increases the speed up to some 20MB/s. This is a great find. Why the hell hasn't the device been properly formatted from the very beginning?

Re: N9 : Slow USB speed
 

What was your previous cluster size?
I checked mine (with Windows, chkdsk command), and it says 65536 B.

Re: N9 : Slow USB speed
 

Yeah, 64KB and I never formatted MyDocs before. This must be the default factory setting.

I bet there are hundreds of people cursing N9's USB speeds not knowing this can be fixed.

Re: N9 : Slow USB speed
 

Confirmed! I have just reformated and the speed indeed increased to around 18MB/s. This really is kind of strange, why would Nokia ship the device with 65536 B block size?!