diff --git a/delog/delog.cpp b/delog/delog.cpp
index a3e72f2..ad07edb 100644
--- a/delog/delog.cpp
+++ b/delog/delog.cpp
@@ -4,6 +4,7 @@
 #include <stdlib.h>
 #include <time.h>
 #include <unistd.h>
+#include <ctype.h>
 #include "delog.h"
 #define wmj_null (_I)-1
 
@@ -289,6 +290,8 @@ _wmj_delog_END:
 #define fmt_ext_hex(s, n) fmt_str(s, n, "XX ")
 #define fmt_continue(s, n, num) fmt_str(s, n, ".. (mode %d bytes not show)\n", num)
 #define fmt_new_line(s, n, addr) fmt_str(s, n, "\n0x%08x : ", _Lclr(addr, 4))
+#define fmt_ascii(s, n, d) fmt_str(s, n, "%c", isprint(d)?(_u8)(d):'.')
+#define fmt_dot(s, n) fmt_str(s, n, "x")
 
 #define DEF_SHOW_MAX 256
 #define LINEBSIZE 4
@@ -300,17 +303,28 @@ _I print_bin(_s s, _I size, _u8 *p, _I len) {
     _I suffixnum;
     _I i = 0, j = 0, re = 0, n = size;
     if (prefixnum) {
+        // 有前缀X
         fmt_new_line(s, n, (_u32)(_i64)(p + i));
     }
-        //printf("%x\n%s\n", prefixnum, ms_buf);
-
+    //printf("%x\n%s\n", prefixnum, ms_buf);
     while (i < prefixnum) {
+        // 打印X
         fmt_ext_hex(s, n);
         i++;
     }
 
+    _I last_i = i;
     while ((i < DEF_SHOW_MAX) && (len > 0)) {
         if ((i & _BITS_MASK(LINEBSIZE)) == 0) {
+            last_i = LINENUM;
+            if (j > 0 && j < LINENUM + 1) {
+                for (int t = 0; t < LINENUM - j; t++)
+                    fmt_dot(s, n);
+                last_i = j;
+            } 
+            while (j > 0 && last_i--) {
+                fmt_ascii(s, n, p[j - last_i - 1]);
+            }
             fmt_new_line(s, n, (_u32)(_i64)(p + i));
         }
         fmt_one_hex(s, n, p[j]);
@@ -318,10 +332,37 @@ _I print_bin(_s s, _I size, _u8 *p, _I len) {
         j++;
         len--;
     }
-    suffixnum = _LNclr(LINENUM - i, 4);
-    while (suffixnum) {
+    i = suffixnum = _LNclr(LINENUM - i, 4);
+    i = 0;
+    while (i < suffixnum) {
         fmt_ext_hex(s, n);
-        suffixnum--;
+        i++;
+    }
+ 
+    i = 0;
+    if (len) {
+        last_i = LINENUM;
+        if (j > 0 && j < LINENUM + 1) {
+            for (int t = 0; t < LINENUM - j; t++)
+                fmt_dot(s, n);
+            last_i = j;
+        }
+        while (j > 0 && last_i--) {
+            fmt_ascii(s, n, p[j - last_i - 1]);
+        }
+    } else {
+        last_i = LINENUM - suffixnum;
+        if (j < LINENUM)
+            last_i -= prefixnum;
+        if (j + prefixnum < LINENUM)
+            while(prefixnum--)
+                fmt_dot(s, n);
+        while (last_i--) {
+            fmt_ascii(s, n, p[j - last_i]);
+        }
+    }
+    while (suffixnum--) {
+        fmt_dot(s, n);
     }
     if (len > 0) {
         fmt_new_line(s, n, (_u32)(_i64)(p + i));
diff --git a/fs/ext2/ext2_fs.cpp b/fs/ext2/ext2_fs.cpp
index d848a0a..03e2581 100644
--- a/fs/ext2/ext2_fs.cpp
+++ b/fs/ext2/ext2_fs.cpp
@@ -16,12 +16,12 @@ void EXT2_FS::printFS() {
     using namespace std;
     cout << endl;
     cout << "文件系统中Inode数量 " << sb->inodes_count << endl;
-    cout << "文件系统中总块数 " << sb->blocks_count << endl;
+    cout << "以块为单位的文件系统大小 " << sb->blocks_count << endl;
     cout << "文件系统中保留块数目 " << sb->r_blocks_count << endl;
     cout << "文件系统中空闲块数目 " << sb->free_blocks_count << endl;
     cout << "文件系统中空闲Inode数量 " << sb->free_inodes_count << endl;
-    cout << "第一个数据块的位置 " << sb->first_data_block << endl;
-    cout << "块大小 " << 1024 * pow(2, sb->log_block_size) << endl;
+    cout << "第一个使用的块号 " << sb->first_data_block << endl;
+    cout << "块大小 " << 1024 * (1 << sb->log_block_size) << endl;
     cout << "逻辑片大小 " << sb->log_frag_size << endl;
     cout << "每组块数 " << sb->blocks_per_group << endl;
     cout << "每组碎片数 " << sb->frags_per_group << endl;
@@ -45,6 +45,10 @@ void EXT2_FS::printFS() {
     }
 }
 
+int EXT2_FS::block_to_pos(int block) {
+    return (block - 1) * sb->log_block_size + 1024;
+}
+
 void EXT2_FS::mount() {
     sb = new SuperBlock();
     dev->seek(1024);  // 跳过引导块
@@ -55,16 +59,24 @@ void EXT2_FS::mount() {
     _si(sb->log_block_size);
     _si(sb->blocks_count);
     _si(sb->blocks_per_group);
+
+    // 1024 * (1 << sb->log_block_size) * 8;
     
     dev->seek(1024 * (1 << sb->log_block_size) + 1024);  // 指向GDT
 
-    int group_cnt = sb->blocks_count / sb->blocks_per_group;
+    int group_cnt = 8 * sb->blocks_count / sb->blocks_per_group;
     for (int i = 0; i < group_cnt; i++) {
         GroupDescriptor* gtp = new GroupDescriptor();
         dev->read(sb_buf, sizeof(GroupDescriptor));
-        memmove(gtp, sb_buf.data, 1024);
+        memmove(gtp, sb_buf.data, sizeof(GroupDescriptor));
         gdt_list.push_back(gtp);
     }
+
+    // 数据块位图
+    dev->seek(block_to_pos(gdt_list.front()->block_bitmap));
+    dev->read(sb_buf, sb->log_block_size);
+    _sa(sb_buf.data + 5, 5);
+    
     printFS();
 }
 
diff --git a/fs/ext2/ext2_fs.h b/fs/ext2/ext2_fs.h
index 3456f12..9ef6845 100644
--- a/fs/ext2/ext2_fs.h
+++ b/fs/ext2/ext2_fs.h
@@ -159,8 +159,10 @@ struct DirEntry {
 
 class EXT2_FS: VFS::FS {
     std::list<GroupDescriptor*> gdt_list;
-    void printFS();
     SuperBlock* sb;
+
+    void printFS();
+    int block_to_pos(int block);
 public:
     EXT2_FS(Dev::BlockDevice* dev);
     void mount();