diff --git a/examples/mass/mass.ino b/examples/mass/mass.ino
index 50d0d0e..47c1419 100755
--- a/examples/mass/mass.ino
+++ b/examples/mass/mass.ino
@@ -7,14 +7,14 @@ USBCompositeSerial CompositeSerial;
 
 #include "image.h"
 
-bool write(uint32_t memoryOffset, const uint8_t *writebuff, uint16_t transferLength) {
-  memcpy(image+memoryOffset, writebuff, transferLength);
+bool write(const uint8_t *writebuff, uint32_t memoryOffset, uint16_t transferLength) {
+  memcpy(image+SCSI_BLOCK_SIZE*memoryOffset, writebuff, SCSI_BLOCK_SIZE*transferLength);
 
   return true;
 }
 
-bool read(uint32_t memoryOffset, uint8_t *readbuff, uint16_t transferLength) {
-  memcpy(readbuff, image+memoryOffset, transferLength);
+bool read(uint8_t *readbuff, uint32_t memoryOffset, uint16_t transferLength) {
+  memcpy(readbuff, image+SCSI_BLOCK_SIZE*memoryOffset, SCSI_BLOCK_SIZE*transferLength);
   
   return true;
 }
@@ -55,7 +55,7 @@ void dumpDrive() {
 
 void setup() {
   USBComposite.setProductId(PRODUCT_ID);
-  MassStorage.setDrive(0, sizeof(image), read, write);
+  MassStorage.setDriveData(0, sizeof(image)/SCSI_BLOCK_SIZE, read, write);
   MassStorage.registerComponent();
   CompositeSerial.registerComponent();
   USBComposite.begin();
@@ -68,4 +68,4 @@ void loop() {
       dumpDrive();
   }
 }
-
+
diff --git a/examples/sdreader/sdreader.ino b/examples/sdreader/sdreader.ino
index 9336f82..106d831 100755
--- a/examples/sdreader/sdreader.ino
+++ b/examples/sdreader/sdreader.ino
@@ -17,12 +17,12 @@ const uint8_t SD_CHIP_SELECT = SS;
 bool enabled = false;
 uint32 cardSize;
 
-bool write(uint32_t memoryOffset, const uint8_t *writebuff, uint16_t transferLength) {
-  return sd.card()->writeBlocks(memoryOffset/512, writebuff, transferLength/512);
+bool write(const uint8_t *writebuff, uint32_t startSector, uint16_t numSectors) {
+  return sd.card()->writeBlocks(startSector, writebuff, numSectors);
 }
 
-bool read(uint32_t memoryOffset, uint8_t *readbuff, uint16_t transferLength) {
-  return sd.card()->readBlocks(memoryOffset/512, readbuff, transferLength/512);
+bool read(uint8_t *readbuff, uint32_t startSector, uint16_t numSectors) {
+  return sd.card()->readBlocks(startSector, readbuff, numSectors);
 }
 
 void setup() {
@@ -34,7 +34,7 @@ void setup() {
 void initReader() {
   digitalWrite(LED_PIN,0);
   cardSize = sd.card()->cardSize();  
-  MassStorage.setDrive(0, cardSize*512, read, write);
+  MassStorage.setDriveData(0, cardSize, read, write);
   MassStorage.registerComponent();
   CompositeSerial.registerComponent();
   USBComposite.begin();
@@ -54,4 +54,4 @@ void loop() {
     MassStorage.loop();
   }
 }
-
+