Index: branches/rewrite/i386/modules/BiosDisk/include/Disk.hpp
===================================================================
--- branches/rewrite/i386/modules/BiosDisk/include/Disk.hpp	(revision 1083)
+++ branches/rewrite/i386/modules/BiosDisk/include/Disk.hpp	(revision 1084)
@@ -17,7 +17,8 @@
     virtual IOReturn    Read(UInt64 sector, UInt64 size, UInt8* buffer) = 0;
     virtual IOReturn    Write(UInt64 sector, UInt64 size, UInt8* buffer) = 0;
 
-    virtual bool        isValid() { return mName != NULL && mBytesPerSector; };
+    virtual bool        isValid()           { return mName != NULL && mBytesPerSector; };
+    virtual UInt32      bytesPerSector()    { return mBytesPerSector; };
 protected:
     const char      *mName;
     const char      *mBusType;
Index: branches/rewrite/i386/modules/BiosDisk/Main.cpp
===================================================================
--- branches/rewrite/i386/modules/BiosDisk/Main.cpp	(revision 1083)
+++ branches/rewrite/i386/modules/BiosDisk/Main.cpp	(revision 1084)
@@ -14,10 +14,18 @@
 
 void BiosDisk_start()
 {
+    UInt8* mbr = (UInt8*)malloc(512);
+    
     BiosDisk* disk = new BiosDisk("bios:/hd0/");
+    disk->Read(0, 1, mbr);
+    printf("mbr[0] = 0x%X\n", mbr[0]);
 
+    printf("mbr[510] = 0x%X\n", mbr[510]);
+    printf("mbr[511] = 0x%X\n", mbr[511]);
     printf("This is a simple BootDisk_start test.\n");
     delete disk;
+    
+    
 
     halt();
 }
\ No newline at end of file
Index: branches/rewrite/i386/modules/BiosDisk/BiosDisk.cpp
===================================================================
--- branches/rewrite/i386/modules/BiosDisk/BiosDisk.cpp	(revision 1083)
+++ branches/rewrite/i386/modules/BiosDisk/BiosDisk.cpp	(revision 1084)
@@ -96,20 +96,35 @@
 IOReturn BiosDisk::Read(UInt64 sector, UInt64 size, UInt8* buffer)
 {
     if(!isValid()) return kIOReturnNoDevice;
-    return kIOReturnSuccess;
+    
+    // Assume EBIOS capable for now...
+    if(EBIOSRead(sector, size) == 0)
+    {
+        bcopy((void*)BIOS_ADDR, buffer, size * mBytesPerSector);
+        return kIOReturnSuccess;
+    }
+    else return kIOReturnIOError;
 }
 
 
 IOReturn BiosDisk::Write(UInt64 sector, UInt64 size, UInt8* buffer)
 {
+    
     if(!isValid()) return kIOReturnNoDevice;
-    return kIOReturnNotWritable;
+    
+    bcopy(buffer, (void*)BIOS_ADDR, size * mBytesPerSector);
+    
+    if(EBIOSWrite(sector, size) == 0)
+    {
+        return kIOReturnSuccess;
+    }
+    else return kIOReturnIOError;
 }
 
 
 UInt8 BiosDisk::BIOSRead(UInt16 cylinder, UInt8 head, UInt8 sector, UInt8 count)
 {
-    if(sector == 0) return -1;
+    sector++;   // starts at 1
     
     biosBuf_t bb;
     int i;