Hard drive repair and data recovery information
First step in do it yourself hard drive repair
Hard drive repair processes and equipment
The most important tool you MUST have if data is irreplaceable
System Area Problems

Bad Translator, Grown Defects, Log Files and Smart can reak havoc with a drive.
Hard drive repair processes and equipment
The most important tool you MUST have if data is irreplaceable
hard drive repair system area techniques.

Remember if data is important please consider the experts!




The System Area is a reserved space dedicated to the hard drive's own needs, such as: storing SMART logs, defect reallocation tables, program code (overlays), Max LBA ( Drives total size ) basically all the information the drive needs to operate.

Data on the hard drive is encoded several times to make sure the data is read correctly. Remember, there is no absolute positive or negative, the data is magnetic so the drive needs to verify the proximity of the positive or negative side of the pole.

The Flash EEPROM chip located on the PCB (printed circuit board)  contains only a small part of the Firmware; its primary role is to spin up the spindle and unpark heads so that the drive can read the remainder of the firmware from the Service Area of the platters.

The Service Area is not accessible with standard ATA commands; it cannot be read or written with any software because the protocol is vendor and drive family-unique.
Furthermore, hard drive vendors do not disclose any information about their hard drive Service  Area structure or how to access it.
MAXTOR SYSTEM AREA DIAGNOSTIC REPORT INFORMATION

One of the most common drives with system area problems was the Maxtor Diamond Max Plus 8 or N40P
First sign of Problems would be the computers boot process halting at Primary Hard Drive failure & the Last Character of the Drive would be Z

The drive would sometimes be recognized as an N40P and will not display a serial Number

After Repairs to this area is made the drive would display the correct Serial number
Then it Should be fixed, try cloning it.

Question
Do I have to repair all failed modules?

Answer
No, they are number in importance. The ones marked as level 4 priority are not necessary in all cases needed for the recovery of the drive.

You notice g list and p list etc have a 1 next to them. They must be recovered for the drive to work at all. [4] are usually not necessary.

The reason the drive thought is was 20gb is because we loaded a working SA into memory for an Identical chipset and it recovered and repaired that module as such. That is why I took a chance with your identical 40gb drive even though the CPU was not identical. But i looked at the size of the g list of the good drive and the crc of the good drive against the bad they both matched so i figured it would work.

So did the p list identical from the good to the bad in size and crc and header info.

Which were 18?

G-list was 1B

That is why when you sent me the list and the only Fails is saw were all marked 4, I looked else where because failures in those modules would not cause the drive to be unrecoverable.


BAD MAP EXAMPLE
============================================================
ID      UBA      LENGTH          READ  CRC      HEADER                                        
============================================================
00     45A0           2       OK                             
01     45A2           2       OK        OK                      
03     45A4           1       OK        OK                      
04    45A6         120       OK                             
05     4634           1       OK                             
08     4635           1       OK        OK                      
09     4637           1       OK                             
0A     4638           1       OK                             
0B     4639           1       OK                             
0C     463A           1       OK                             
0D     2D68           3       OK       OK                              [4]
0E     2D6B           8       OK        OK                              [4]
0F     2D73           1       OK        OK                      
10     2D74           2       OK                ZB             
11     2D77           1       OK        OK                              [4]
12     30FD        2280        OK                             
13     2D79           8       OK        OK                      
14     3060          17       OK        OK                                  [4]
16     30D7          16       OK        OK                      
18     0029         313       OK        OK             AT_PDL 1     [1] P-LIST, Factory defect list
19     01A8           1       OK                             
1A     01A9           1       OK               SECU            [3] Master and User passwords
1B     02C2          25       OK        FAIL            NO_GLIST-   [1] G-LIST, Grown defect list
1C     01BD           2       OK                             
1D     02C0           2       OK        OK         DMCS   1       [2] System Area cache
1E     01A6           1       OK        OK         SRV6 ] ] ]      [1] Adaptive data
1F     0008           1       OK        OK         DISK                [2] DISK - Passport
20     02DB           2       OK                             
21     0162          17       OK        OK             RCT0`F\J^b [1] Adaptive data
22     01BB           1       OK        OK         ATAF                [4] Flags
24     3A4C         368       OK                             
27     3BBC          14       OK                             
28     3BCA        1472        OK                             
29     418A          39       OK                             
2A     463B           1       OK                             
2B     463C          12       OK                             
2D     4648          12       OK                             
2F     01AA           1       OK                                 [4] SMART Tresholds
30     01AB           1       OK                                [4] SMART Attributes - RAW data
32     01BC           1       OK                             
33     15F8        6000        OK        OK             LHTU L          [4] Information about defects
34     01BF         256       OK                    RAER_H10       [4]
37     0004           1       OK        OK         U_LIST00         [1] U_LIST - System area variables
38     05B8         160       OK              MO          c5000       [2] Overlay data block 1
39     04B8         256       OK        OK                          [2] ROM copy
41     01AD           2       OK      FAIL                      
42     30F8           5       OK        OK                      
43     2D76           1       OK        OK                          [4]
44     01A7           1       OK                             
45     01AF          12       OK                             
46     3071          17       OK        OK                          [4] Selfscan variables
47     30B5          17       OK        OK                          [4]
48     02BF           1       OK        OK      E128L2NE      [4] Parts information
49     3059           1       OK        OK                      
4A     305E           2       OK        OK                      
4B     41B1           1       OK        OK                      
4C     2D78           1       OK        OK                      
4D     45A5           1       OK        OK                      
4E     4636           1       OK        OK                      
4F     0658         768       OK        OK      MO   c506       [2] Overlay data block 2
54     41B2           4       OK        OK                      
55     41BA           2       OK        OK                      
56     2D99         160       OK                             
57     41C0          12       OK        OK                      
58     30E7          17       OK        OK                      
59     39E5          12       OK                             
5A     461E           8       OK                             
5B     4626           2       OK                             
5C     4628          12       OK                             
5D     4654           3       OK                             
5E     02F6         128       OK                EVTLG_00    [4]
5F     4657           1       OK                             
60    41BC           4       OK                             
61     39F1           1       OK        OK                      
62     39F2           1       OK                             
63     01AC           1       OK                                 [4] SMART Attributes - backup
64     02DE           1       OK      FAIL   MAXATG       [4]
65     02DF           9       OK                             
66     02E8           9       OK                             
67     02F1           5       OK                             
68     2D6A           1       OK        OK                      
69     3019          16       OK        OK                      
6A     305D           1       OK        OK                      
6B     30C6          17       OK        OK                      
70     0376           1       OK                                 [4] SMART Summary log
71     0377           1       OK                                 [4] SMART Selftest log
72     0378          32       OK                                [4] SMART Vendor log
73     0398           8       OK                             
74     4658           1       OK                             
75     4659           1       OK                             
76     465A           1       OK                             
77     39F3           1       OK                             
78     0009          32       OK        OK      RZTBL  1          [2] Zone table
79     465B           1       OK                             
7A     7E73           1       OK        OK      U_LIST01         [4] U_LIST - Backup Copy! Can use it to
                                    Recover U_LIST
7B     03A0           8       OK                FW      2           [4]
7C     3071          68       OK        OK                      
7D     2D79          32       OK        OK                      
7E     2D99         640       OK                             
7F     3019          64       OK        OK                      
80     39F4          16       OK                             
81     3059           4       OK        OK                      
82     465C           2       OK        OK                      
83     4660           4       OK                version             [4] Parts information
84     4664           1       OK                             
85     4665           1       OK                             
86     4666          12       OK                             
87     4672           1       OK                             
88     4673           1       OK                             
89     4674          12       OK                             
8A     4680           2       OK                !R              
8B     4682           2       OK                !R              
8D     3A04           4       OK                             
8E     4684           1       OK                             
8F     4685           4       OK                             
92     41CC          72       OK                             
94     03A8          64       OK                             
95     03E8           1       OK                DISK    PW      
96     0E58         160       OK                MO    5000      
97     0D58         256       OK                             
98     0EF8         768       OK                MO    50'       
99     03E9           2       OK                             
9A    03EB           2       OK                             
9B     3A08           4       OK                             
9C     4214          64       OK                             
9D     4689           1       OK                             
9E     03ED           2       OK                             
9F     468A           2       OK                             
A0     4254         100       OK                             
A2     468C           2       OK                             
A3     42B8          64       OK                             
A4     3A0C          24       OK                             
A5     03EF           4       OK                             
A6     03F3           2       OK                B A ? B @       




First step in do it yourself hard drive repair
System area hard drive repair