diff --git a/device.aii b/device.aii
index 0d15ce9..0aa6b85 100644
--- a/device.aii
+++ b/device.aii
@@ -36,7 +36,7 @@ device_write proc export
 
 
 	;
-	; inputs: a = block number. (1024 blocks)
+	; inputs: a = block number. (1024 byte block)
 	;
 	;
 read_data_block proc export
@@ -59,11 +59,16 @@ loop
 	rts
 
 read_it
+	; a = block num (1024-byte).
+	; multiply x 2 for 512-byte blocks.
+	asl a
 	sta dev_blk_num
-	stz dev_blk_num+2
+	lda #0
+	rol a
+	sta dev_blk_num+2
 
 	lda #1024
-	sta dev_blk_size
+	;sta dev_blk_size
 	sta dev_req_cnt
 	stz dev_req_cnt+2
 
diff --git a/get_dir_entry.aii b/get_dir_entry.aii
index e039dd4..fb63cea 100644
--- a/get_dir_entry.aii
+++ b/get_dir_entry.aii
@@ -238,8 +238,9 @@ init	proc
 	lda #in_cache
 	sta dev_parms.dev_cache_pr
 
+	; should probably read half-blocks...
 	lda #1024
-	sta dev_parms.dev_blk_size
+	;sta dev_parms.dev_blk_size
 	sta dev_parms.dev_req_cnt
 
 
diff --git a/get_file_info.aii b/get_file_info.aii
index c10a186..0d43c23 100644
--- a/get_file_info.aii
+++ b/get_file_info.aii
@@ -42,7 +42,7 @@ get_file_info	procname export
 
 	;~DebugSetTrace #1
 
-	brk $ea
+	;brk $ea
 	jsr path_to_inode
 	bcs exit
 
@@ -165,8 +165,8 @@ load_inode	procname export
 	sta dev_blk_num
 
 	lda #512
+	;sta dev_blk_size
 	sta dev_req_cnt
-	sta dev_blk_size
 
 	; dev_num must already be set up.
 	;lda device ;;;;
diff --git a/id_disk.aii b/id_disk.aii
index 0cc54eb..eca7eab 100644
--- a/id_disk.aii
+++ b/id_disk.aii
@@ -49,12 +49,13 @@ id_disk	procname	export
 	sta dev_num
 
 	lda #512
-	sta dev_blk_size
+	;sta dev_blk_size
+	sta dev_req_cnt
+
+
 	lda #SUPER_BLOCK*2
 	sta dev_blk_num
 
-	lda #512
-	sta dev_req_cnt
 
 	jsr device_read
 	bcs exit
diff --git a/main.aii b/main.aii
index 3c23b1b..0dbfc0e 100644
--- a/main.aii
+++ b/main.aii
@@ -219,14 +219,19 @@ app_entry	procname
 	sta io_buffer+2
 	sta dev_parms.dev_buff+2
 
+	;
+	; minix uses 1024 byte blocks... however, appledisk3.5 can only read 256, 512, or 524 byte blocks.
+	;
+	lda #512
+	sta dev_parms.dev_blk_size
+	stz dev_parms.dev_blk_size+2
+
 	stz dev_parms.dev_num
 	stz dev_parms.dev_callnum
 	stz dev_parms.dev_req_cnt
 	stz dev_parms.dev_req_cnt+2
 	stz dev_parms.dev_blk_num
 	stz dev_parms.dev_blk_num+2
-	stz dev_parms.dev_blk_size
-	stz dev_parms.dev_blk_size+2
 
 	stz my_fcr
 	stz my_fcr+2
@@ -239,6 +244,7 @@ app_entry	procname
 	stz <tool_error
 	;stz <device
 
+
 	; fake an rtl address for sys_exit
 	; otherwise, would need to jml sys_exit from functions.
 	pea |(sys_exit-1)>>8