/// <summary>
/// This method discover the current ATA device and try to read all its configurations
/// </summary>
private void Discover()
{
DriveInfo.Device = Device.IDE_None;
DriveInfo.BufferSize = 0;
Status xStatus;
bool Error = false;
//Select Drive
SelectDrive();
//Send Identify command
CommandReg.Byte = (byte)Cmd.ATA_CMD_IDENTIFY;
Wait();
if (StatusReg.Byte == 0)
{
return; //No Device
}
while (true)
{
xStatus = (Status)StatusReg.Byte;
if ((xStatus & Status.ATA_SR_ERR) != 0)
{
Error = true; // If Err, Device is not ATA.
break;
}
if (((xStatus & Status.ATA_SR_BSY) == 0) && ((xStatus & Status.ATA_SR_DRQ) != 0))
{
break; //Everything is fine
}
Wait();
}
DriveInfo.Device = Device.IDE_ATA;
DriveInfo.BufferSize = 512;
// (IV) Probe for ATAPI Devices:
if (Error)
{
ushort xTypeID = (ushort)(LBA2.Byte << 8 | LBA1.Byte);
if (xTypeID == 0xEB14 || xTypeID == 0x9669)
{
DriveInfo.Device = Device.IDE_ATAPI;
DriveInfo.BufferSize = 2048;
}
else
{
DriveInfo.Device = Device.IDE_None;
DriveInfo.BufferSize = 0;
return;
}
//Send Identify packet command
CommandReg.Byte = (byte)Cmd.ATA_CMD_IDENTIFY_PACKET;
Wait();
}
var xBuff = new ushort[256];
DataReg.Read16(xBuff);
//ATA/ATAPI COnfig
DriveInfo.IsRemovable = (xBuff[(int)Identify.ATA_IDENT_DEVICETYPE] & (1 << 7)) > 0;
//CHS configurations
DriveInfo.Cylinder = xBuff.ToUInt32((int)Identify.ATA_IDENT_CYLINDERS);
DriveInfo.Heads = xBuff.ToUInt32((int)Identify.ATA_IDENT_HEADS);
DriveInfo.SectorsPerTrack = xBuff.ToUInt32((int)Identify.ATA_IDENT_SECTORS);
DriveInfo.CommandSet = xBuff.ToUInt32((int)Identify.ATA_IDENT_COMMANDSETS);
ushort xFieldValid = xBuff[(int)Identify.ATA_IDENT_FIELDVALID];
//1st bit determine weather it support LBA or not
DriveInfo.LBASupport = (bool)((xFieldValid & 1) == 1);
if ((DriveInfo.CommandSet & (1 << 26)) != 0)
{
// Device uses 48-Bit Addressing:
DriveInfo.Size = xBuff.ToUInt48((int)Identify.ATA_IDENT_MAX_LBA_EXT);
}
else
{
// Device uses CHS or 28-bit Addressing:
DriveInfo.Size = xBuff.ToUInt32((int)Identify.ATA_IDENT_MAX_LBA);
}
//Read Model, Firmware, SerialNo.
DriveInfo.Model = xBuff.GetString((int)Identify.ATA_IDENT_MODEL, 40);
DriveInfo.SerialNo = xBuff.GetString((int)Identify.ATA_IDENT_SERIAL, 20);
}