USB Host driver does not work with Sandisk

[Jun]

hi, I am working on USB host driver now. I got it work for most of the USB device I have on hand except the Sandisk which is the most popular brand.

During the enumeration, all device including the Sandisk USB stick response to the "get device descriptor" request . After that, the host assigns an address for the device, then send the "get device descriptor" request again. All other device still response but not the Sandisk.

anyone had the same problem before? or any suggestion?

Thanks a lot!!!

[Ttelmah]

Have you tried some other (older) Sandisk cards?.

There were huge problems with faulty Sandisk SD's on the Galaxy S3 and S4's a couple of years ago, there are also a very large number of 'forged' Sandisk cards on the market. Recently there has been another problem with genuine cards being faulty in the larger sizes.

Are you running SD, or SDHC?. Have you looked at what is needed to support the latter?.

[Jun]

Thanks, Ttelmah
It is actually not a SD card. But an USB stick.
I am using the SanDisk Cruzer Switch USB stick.

[Ttelmah]

Have a look at this:

<http://www.microchip.com/forums/m707827.aspx>

Note the reformatting needed to bypass the security.

[Jun]

Thank you very very much!!! Ttelmah

I guess all I can do now, it is put that in our document to tell our customer do the format before using it. Although I know they will never read the instruction!