Active sync USB file transfer speeds very slow

[Guest hardysmith]

I have noticed that the file transfer rate from PC to phone using activesync is approximately 4MB per minute.

Files totalling 64MB (very roughly a full audio CD converted to MP3)

takes 16 minutes to transfer!!

This seems kind of slow to me. Is this an I/O limitation of the phone or the memory (SD in my case)?

The phone uses USB 1.1 and the theoretical limits of USB 1.1 transfer are 12MB/s for full speed USB devices and 1.5MB/s for low speed devices.

Obviously, the 4MB per minute transfer to the SPV is a lot less than even the slowest transfer rate.

On a per second basis, the SPV transfer is roughly 67Kb/s, i.e. 67,000 bytes per second.

Consider that a serial port is capable of 115kb/s and it's not looking good for file transfer into the SPV is it?

I also have a diamond RIO mp3 player and I can transfer 64MB in less than one minute.

There is a big difference between 1 minute and 16 minutes!!!!!!!

So, what's going on? Bad software? Bad hardware?

Bad phone...full stop.

[Guest The Futures Bright]

You are so right, I pop my SD card reader in to transfer my WMA's and MP3's wheeeeeeeeeeeee, marvelous gadget. Like night and day compaired to active stink. ;)

[Guest hardysmith]

Interesting. So a dedicated SD card reader/writer is really quick compared to the SPV activesync transfer.

Is it activesync or is it the interface on thte SPV. What is the interface on the SPV - some kind of serial job?

[Guest hardysmith]

Why oh why do I keep finding shortcomings with the SPV.

THe reason for the slow I/O over activesync, is more than likely due to the port on the SPV. What kind of port is it? Is it just a slow port or a cheap port?

I've ordered a 6 in 1 card reader from ebay as I believe that I will get approximately 1MB/s I/O using this, as opposed to 67kbit/s.

The reason I need faster transfer is because I am using a 256MB SD card filled with MP3's. It currently takes nearly an hour to transfer 256MB using activesync!!!!

The dedicated card reader/writer should transfer 256MB in about 4 minutes.

There are no excuses for this really. Yet another irritating feature of the phone. There is a big difference between 4 minutes and an hour.

[Guest awarner [MVP]]

There are no excuses for this really. Yet another irritating feature of the phone. There is a big difference between 4 minutes and an hour.

one thing you are forgetting, yes the phone connects via a usb cradle but the phones actual connector is a serial one, hense the slow speed.

The best thing you can do is get a card reader (small cost) for large movement of files

and use the cradle for installing software.

[Guest hardysmith]

A serial port...that explains the 60 - 100kb/s transfer rate!

I kind of expected a USB port or similar on the phone. What's the point in putting a USB at one end and a serial at the other.

I wonder why it's a serial connector on the phone? Are they cost cutting here? Why not just connect it to the com port instead of USB!

Maybe I didn't look into this phone enough.

Still, it's a great piece of kit, and I do love it...but there are many irritations.

[Guest DJHope]

Aprently you can change a TCP window size or something that might speed things up i havnt tried it but the tip is on here

http://www.phm.lu/PocketPC/RegTweaks/

Dont worry that its pocket pc the differences between SPV and PocketPC are VERY small.

Obviously you would need to de-cripple your fone first.

DJ Hope

[Guest Scarfman007]

I'm reasonably sure that the maximum transfer speed of USB1.1 is 12 (or is it 11?) Megabits per second, not 12 Megabytes. Same applies for serial connection .. it's 115kilobits per second, not kilobytes (things like modems, USB, serial have a baud which is measured in bits, not bytes).

So 8 bits per byte gives USB1.1 speed of 1.5 Megabytes per second .. but still waaay off your 67Kb/s. Still, I think 67Kb/s is better than a serial connection running at (128000 bits / 8 =) 16Kbytes per sec?

Apparently SD cards can do up to 10Megabytes / sec (opposed to MMC 2.5), so to fully take advantage (and fill your 256MB SD in 26seconds!!), you'd need a firewire or USB2 card reader/writer! Gotta get me an Audigy and firewire writer ... ;) .

Chris

[Guest Monolithix [MVP]]

Don't forget files transfered to the SPV have to be "converted", i assume to compensate for the difference between the NTFS/FAT32 and what ever file system SmartPhone uses.

Even so,