diff --git a/src/readmbr.c b/src/readmbr.c
index d11e2ab..468fb39 100644
--- a/src/readmbr.c
+++ b/src/readmbr.c
@@ -1,19 +1,14 @@
 // program to read MBR and its partition table
+#include <unistd.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdint.h>
 
-typedef struct {
-    uint8_t cylinder;
-    uint8_t head;
-    uint8_t sector;
-} __attribute__((packed)) chs_t;
-
 typedef struct {
     uint8_t attributes;
-    chs_t chs_first;
+    uint8_t chs_first[3];
     uint8_t type;
-    chs_t chs_last;
+    uint8_t chs_last[3];
     uint32_t lba_start;
     uint32_t num_sectors;
 } __attribute__((packed)) mbr_part_t;
@@ -26,28 +21,59 @@ typedef struct {
     uint16_t signature;
 } __attribute__((packed)) mbr_t;
 
+void decode_chs(const uint8_t* chs, uint16_t* cylinder, uint16_t* head, uint16_t* sector)
+{
+    *head = chs[0];
+    *sector = chs[1] & 0x3F;
+    *cylinder = (((uint16_t)chs[1]) & 0xC0) << 2 | (uint16_t)chs[2];
+}
+
 int main(int argc, char** argv)
 {
     mbr_t mbr;
 
-    // if (argc < 2)
-    // {
-    //     fputs("provide filename to disk image as first argument\n", stderr);
-    //     return 1;
-    // }
+    if (argc < 2)
+    {
+        fputs("provide filename to disk image as first argument\n", stderr);
+        return 1;
+    }
 
-    // int fd = open(argv[1], O_RDONLY);
-    // if (fd < 0)
-    // {
-    //     perror("failed to open disk image\n");
-    //     return 1;
-    // }
+    int fd = open(argv[1], O_RDONLY);
+    if (fd < 0)
+    {
+        perror("failed to open disk image\n");
+        return 1;
+    }
 
+    if (read(fd, &mbr, sizeof(mbr_t)) < sizeof(mbr_t))
+    {
+        perror("failed to read MBR!\n");
+        close(fd);
+        return 1;
+    }
+    close(fd);
 
-    // close(fd);
+    printf("== Master Boot Record ==\n");
+    printf("Unique ID:\t%u\n", mbr.unique_id);
+    printf("Reserved:\t%u\n", (unsigned int)mbr.reserved);
+    for (unsigned i = 0; i < 4; i++)
+    {
+        const mbr_part_t* part = &mbr.part_table[i];
+        uint16_t cylinder, head, sector;
 
-    printf("%lu\n", sizeof(mbr_t));
-    printf("%lu\n", sizeof(mbr_part_t));
+        printf("Partition:\t%u\n", i);
+        printf("\tAttributes:\t%u (%s)\n", part->attributes, part->attributes & 0x80 ? "active" : "");
+        printf("\tType:%u\n", part->type);
+
+        decode_chs(part->chs_first, &cylinder, &head, &sector);
+        printf("\tCHS First:\tC %u\tH %u\tS %u\n", cylinder, head, sector);
+        
+        decode_chs(part->chs_last, &cylinder, &head, &sector);
+        printf("\tCHS Last:\tC %u\tH %u\tS %u\n", cylinder, head, sector);
+        
+        printf("\tLBA:\t%u\n", part->lba_start);
+        printf("\tTotal Sectors:\t%u\n", part->num_sectors);
+    }
 
     return 0;
 }
\ No newline at end of file