diff --git a/src/userland/scisi/include/scisi.h b/src/userland/scisi/include/scisi.h
index a9ec78c..e44b6be 100644
--- a/src/userland/scisi/include/scisi.h
+++ b/src/userland/scisi/include/scisi.h
@@ -7,6 +7,7 @@
     uint32_t in, out;
     uint32_t serviceId, id;
     uint32_t inFunction, outFunction;
+    uint32_t blockSize;
 } ScisiDevice;
 
 typedef struct {

diff --git a/src/userland/scisi/include/scisi.h b/src/userland/scisi/include/scisi.h
index a9ec78c..e44b6be 100644
--- a/src/userland/scisi/include/scisi.h
+++ b/src/userland/scisi/include/scisi.h
@@ -7,6 +7,7 @@
     uint32_t in, out;
     uint32_t serviceId, id;
     uint32_t inFunction, outFunction;
+    uint32_t blockSize;
 } ScisiDevice;
 
 typedef struct {
diff --git a/src/userland/scisi/main.c b/src/userland/scisi/main.c
index 54c4782..fd74839 100644
--- a/src/userland/scisi/main.c
+++ b/src/userland/scisi/main.c
@@ -38,12 +38,15 @@
     ReadCapacity10Response *response = malloc(sizeof(ReadCapacity10Response));
     response->size = sizeof(ReadCapacity10Response) - sizeof(uint32_t);
     request(device->serviceId, device->inFunction, device->in, U32(getPhysicalAddress(response)));
-    uint32_t blockSize = response->blockSize[0] << 24 | response->blockSize[1] << 16 | response->blockSize[2] << 8 | response->blockSize[3];
+    device->blockSize = response->blockSize[0] << 24 | response->blockSize[1] << 16 | response->blockSize[2] << 8 | response->blockSize[3];
     uint32_t maxLba = response->lastLBA[0] << 24 | response->lastLBA[1] << 16 | response->lastLBA[2] << 8 | response->lastLBA[3];
-    printf("max lba: %x, block size: %x\n", maxLba, blockSize);   
+    printf("max lba: %x, block size: %x\n", maxLba, device->blockSize);   
 }
 
 void *read(ScisiDevice *device, uint32_t address, uint16_t size) {
+    if (size == 0) {
+        return malloc(1);
+    }
     Read10Command *command = malloc(sizeof(Read10Command));
     command->size = sizeof(Read10Command) - sizeof(uint32_t);
     command->operationCode = 0x28;
@@ -51,9 +54,9 @@
     command->lba[1] = (uint8_t) (address >> 16);
     command->lba[2] = (uint8_t) (address >> 8);
     command->lba[3] = (uint8_t) (address);
-
-    command->transferLength[0] = 1;
-    command->transferLength[1] = (uint8_t) (size);
+    uint32_t blockCount = (size-1) / device->blockSize + 1;
+    command->transferLength[0] = (uint8_t) (blockCount >> 8);
+    command->transferLength[1] = (uint8_t) (blockCount);
 
     command->control = 0;