When I tried to transfer a file via USB to the MicroSD, I found that the transfer speed is very slow (around 160KB/s). In comparison, when I transfer to the built-in SD I get around 1500KB/sec, which is still slow but more reasonable.
I took out the MicroSD (4Gig Kingston) and ran CrystalDiskMark 3.0.1 using the laptop's SDHC reader and I got around 12.34 MB/Sec read and 7.342 MB/Sec write speed, so the problem is most likely not the MicroSD Card.
My laptop is currently running Windows 7 Pro, and PRS-T1 is running the latest firmware 1.0.03.11140 and the latest minimal-root.zip.
I don't know enough about minimal-root.zip to know if it has replaced something in the kernel or a device driver that may affect the transfer speed. I am very happy with the mod so I really want to keep it.
I did some googling and this is some discussions I found about slow transfer speed in other devices, and I don't know how relevant they are with respect to Sony PRS-T1:
Slow USB Transfer speeds....
which links this
discussion.
Can someone with the mod try a file transfer and tell me what kind of speed they are getting?
Thanks for you help
ST