Hi,

Doing DoIO with struct IOExtTD (with io_Command set to ETD_RAWREAD) results in error -3 (in io_Error). Where can I find what this errorcode means?

From the autodocs:
IO REQUEST RESULT
io_Error - 0 for success, or an error code as defined in "devices/trackdisk.h"

Nope.

struct IOExtTD
{
    struct IOStdReq iotd_Req;
    ULONG           iotd_Count;
    ULONG           iotd_SecLabel;
};

From the autodocs:
iotd_Count (ETD_RAWREAD only) maximum allowable change counter
value.

Should this latter be set to some value other then 0 in order to get rid of the error?

What is meant with this 'maximum allowable change counter value.'?

OldFart