E50 USB file transfer speed

Hi, All

I have
- Nokia E50 phone;
- 2GByte MicroSD memory card (2MB/sec transfer speed);
- Nokia CA-53 original cable (USB 2.0 with full speed);

I can't get single meaning information about subj.

Nokia support says that speed is 218Kbit/sec,
Service centre says that speed is 418Kbit/sec
When I transfer files to flash, the program says that speed is
502Kbyte/sec (not kbit)
Some unofficial sites say that phone supports USB 2.0 full speed ( it
is 2MByte/sec)
Indian official site says the same
My regional site have no information about it.

What is the true?

PS. The problem is I have to wait at least 15 minutes to upload 2GB of
information via USB .