diff --git a/RaspberryPi/apple2driver/go.mod b/RaspberryPi/apple2driver/go.mod
index 5368a16..2426e5a 100644
--- a/RaspberryPi/apple2driver/go.mod
+++ b/RaspberryPi/apple2driver/go.mod
@@ -2,4 +2,7 @@ module github.com/tjboldt/Apple2-IO-RPi/RaspberryPi/apple2driver
 
 go 1.16
 
-require periph.io/x/periph v3.6.8+incompatible
+require (
+	github.com/tjboldt/ProDOS-Utilities v0.0.0-20210607001541-fa0e76cf84c0
+	periph.io/x/periph v3.6.8+incompatible
+)
diff --git a/RaspberryPi/apple2driver/go.sum b/RaspberryPi/apple2driver/go.sum
index 68e7eb1..a6d7592 100644
--- a/RaspberryPi/apple2driver/go.sum
+++ b/RaspberryPi/apple2driver/go.sum
@@ -1,2 +1,4 @@
+github.com/tjboldt/ProDOS-Utilities v0.0.0-20210607001541-fa0e76cf84c0 h1:iH6+15jJQsUMv9yeC5m26qh8VdJeRmZiYGM1ZG4aLVI=
+github.com/tjboldt/ProDOS-Utilities v0.0.0-20210607001541-fa0e76cf84c0/go.mod h1:eBQRf0U+goRbBOxzFCwRW+FZmALC8dfYaqCwcqwzi74=
 periph.io/x/periph v3.6.8+incompatible h1:lki0ie6wHtvlilXhIkabdCUQMpb5QN4Fx33yNQdqnaA=
 periph.io/x/periph v3.6.8+incompatible/go.mod h1:EWr+FCIU2dBWz5/wSWeiIUJTriYv9v2j2ENBmgYyy7Y=
diff --git a/RaspberryPi/apple2driver/handlers/readBlock.go b/RaspberryPi/apple2driver/handlers/readBlock.go
index c6399a2..ab84b8b 100644
--- a/RaspberryPi/apple2driver/handlers/readBlock.go
+++ b/RaspberryPi/apple2driver/handlers/readBlock.go
@@ -5,6 +5,7 @@ import (
 	"os"
 
 	"github.com/tjboldt/Apple2-IO-RPi/RaspberryPi/apple2driver/a2io"
+	"github.com/tjboldt/ProDOS-Utilities/prodos"
 )
 
 var oldFirmware = false
@@ -31,13 +32,12 @@ func ReadBlockCommand(drive1 *os.File, drive2 *os.File) {
 		file = drive2
 	}
 
-	buffer := make([]byte, 512)
-	var block int64
-	block = int64(blockHigh)*256 + int64(blockLow)
+	var block int
+	block = int(blockHigh)*256 + int(blockLow)
 
 	fmt.Printf("Read block %d\n", block)
 
-	file.ReadAt(buffer, int64(block)*512)
+	buffer := prodos.ReadBlock(file, block)
 
 	err = a2io.WriteBlock(buffer)
 	if err == nil {
diff --git a/RaspberryPi/apple2driver/handlers/writeBlock.go b/RaspberryPi/apple2driver/handlers/writeBlock.go
index c5b60ba..f5b92e7 100644
--- a/RaspberryPi/apple2driver/handlers/writeBlock.go
+++ b/RaspberryPi/apple2driver/handlers/writeBlock.go
@@ -5,6 +5,7 @@ import (
 	"os"
 
 	"github.com/tjboldt/Apple2-IO-RPi/RaspberryPi/apple2driver/a2io"
+	"github.com/tjboldt/ProDOS-Utilities/prodos"
 )
 
 func WriteBlockCommand(drive1 *os.File, drive2 *os.File) {
@@ -29,13 +30,12 @@ func WriteBlockCommand(drive1 *os.File, drive2 *os.File) {
 	}
 
 	buffer := make([]byte, 512)
-	var block int64
-	block = int64(blockHigh)*256 + int64(blockLow)
+	var block int
+	block = int(blockHigh)*256 + int(blockLow)
 
 	fmt.Printf("Write block %d\n", block)
 
 	a2io.ReadBlock(buffer)
-	file.WriteAt(buffer, int64(block)*512)
-	file.Sync()
+	prodos.WriteBlock(file, block, buffer)
 	fmt.Printf("Write block completed\n")
 }