How do I change the MaximumTransferLength in STORAGE_ADAPTER_DESCRIPTO

[rdbntx]

I am trying to download microcode to an ATA hard disk using DeviceIoControl with IOCTL_ATA_PASS_THROUGH_DIRECT. When downloading microcode to ATA drive the entire microcode must be sent in one contiguous buffer which can be as large as 2MB, depending on the drive. DeviceIoControl() was returning a fail status with System Error 87 - Invalid Parameter. I set the transfer length to 0x9000 and I got a pass status. The microcode did not download but DeviceIoControl did not fail. I did an IOCTL_STORAGE_QUERY_PROPERTY and found out that the STORAGE_ADAPTER_DESRIPTOR MaximumTransferLength is set to 0x10000 (64k) and MaximumPhysicalPages is set to 0x10. I believe this is what is limiting the amount of data that I can send, but I have no idea how to change theses settings. The driver is atapi.sys and I can not find anything that points me to the location where these values can be changed.

I have tried this using WinXP SP2 and W2K3 Server SP3 and get the same response.

Below is my code ....

BOOL StorageCommands::StorageQueryBusType(HANDLE hDevice, int * BusType, int * AdptrBus)

{

DWORD NumberOfBytesReturned;

BOOL Status = 0;

// set up Storage Property Query and Storage Adapter Descriptor Structures

STORAGE_PROPERTY_QUERY StoragePropertyQuery;

STORAGE_DEVICE_DESCRIPTOR StDescript = { 0 };

STORAGE_ADAPTER_DESCRIPTOR AdDescript = { 0 };

// get the Adapter bus type

StoragePropertyQuery.PropertyId = StorageAdapterProperty;

StoragePropertyQuery.QueryType = PropertyStandardQuery;

// get Adapter Bus

Status = DeviceIoControl( hDevice,

IOCTL_STORAGE_QUERY_PROPERTY,

&StoragePropertyQuery,

sizeof(STORAGE_PROPERTY_QUERY),

&AdDescript,

sizeof(STORAGE_ADAPTER_DESCRIPTOR),

&NumberOfBytesReturned,

NULL );

if (Status)

{

// set Adapter BusType

*AdptrBus=AdDescript.BusType;

}

// set up Storage Property Query and Storage Device Descriptor Structures

StoragePropertyQuery.PropertyId = StorageDeviceProperty;

Status = DeviceIoControl( hDevice,

IOCTL_STORAGE_QUERY_PROPERTY,

&StoragePropertyQuery,

sizeof(STORAGE_PROPERTY_QUERY),

&StDescript,

sizeof(STORAGE_DEVICE_DESCRIPTOR),

&NumberOfBytesReturned,

NULL );

if (Status)

{

// set Device BusType

*BusType=StDescript.BusType;

}

return (Status);

}

BOOL ATA_Commands::DownloadMicrocode(HANDLE hDevice, ATA_PASS_THROUGH_DIRECT *pATAData, unsigned char *buffer, DWORD datasize)

{

BOOL status = 0;

DWORD sectors = datasize / 512;

DWORD dsize = sizeof(ATA_PASS_THROUGH_DIRECT);

DWORD bytescopied = 0;

// clear contents of pATAData

ZeroMemory(pATAData, dsize);

// Fill in WRITE SECTORS query data

pATAData->Length = (USHORT) dsize;

pATAData->DataTransferLength = datasize;

pATAData->AtaFlags = ATA_FLAGS_DATA_OUT;

pATAData->TimeOutValue = 180; // Seconds

pATAData->DataBuffer= (PVOID) buffer;

pATAData->CurrentTaskFile[0] = 0x07; // FEATURES REG - save download code

pATAData->CurrentTaskFile[1] = LOBYTE(LOWORD(sectors)); // SECTOR COUNT REG - LSB of sectors

pATAData->CurrentTaskFile[2] = HIBYTE(LOWORD(sectors)); // LBA LOW REG - MSB of sectors

pATAData->CurrentTaskFile[3] = 0x00; // LBA MID REG

pATAData->CurrentTaskFile[4] = 0x00; // LBA HIGH REG

pATAData->CurrentTaskFile[5] = 0x00; // DEVICE REG

pATAData->CurrentTaskFile[6] = 0x92; // COMMAND REG

status = DeviceIoControl( hDevice,

IOCTL_ATA_PASS_THROUGH_DIRECT,

pATAData,

datasize, /* input buffer and size */

pATAData,

datasize, /* output buffer and size */

&bytescopied, /* bytes copied to output buffer */

NULL); /* not overlapped */

if (status == 0)

{

printf("Error: %ld", GetLastError());

}

return (status);

}

Thanks for any help in this.