Preventing hard disk firmware manipulation attack and disaster recovery by Dai Shimogaito

Disaster Data Recovery method for HDD

by Dai Shimogaito

January, 17th, 2014

　 at CODEBLUE in Tokyo

1.To Recover Computer Systemwhich had suffered from natural disaster, like

tsunami, river flood, storm, and earthquake

Platter Surface Damage

2.To Protect Computer System and get Readyfor a large scale crash.

What is Disaster Recovery ?

AFTERDisaster

The most difficult problem for data

recovery

BEFOREDisaster

Physical Damage caused by Software

HDD Customization for Platter Damage

Three Failures Lead to Data Loss

• Logical Failure• System failure• Data corruption• Deletion of data.

• Electronic Failure• Printed Circuit Board (PCB)• On or more of the PCB components• ROM or the System Area data is damaged.

• Physical Failure• Sticktion• Spindle bearing is frozen• Head crash (dropped hard drive).

Features of HDD which suffered from natural disaster

1. Chips on PCB are gone

2. HDD falls down and gets stong shock

3. Dirt comes inside HDD

4. Water comes inside HDD

Severe Damage !Normal Data Recovery Process is useless, because the damage level is extremely high

After a Natural Disaster, HDD can look like this

What is Data Recovery ?

Trying to image data from non-accessible HDD sector by sector.アクセス不能な HDD から、できるだけ多くのデータをクローンコピー取得を試みる

Copy

BrokenNo access to data

（故障でアクセス不能）

GoodFull Access to data

（正常動作する HDD）

What is Data Recovery ?

Basically, parts replacement is the way for temporary repair.基本的には、故障した部品を交換して、一時的に HDD を復活させます。

Fire Accident

What is Data Recovery ?

100% clone is always preferrable, but the result depends on the type of damage to HDD and the data recovery process.

できれば 100 ％クローンコピーの作成が望ましいのですが、故障の種類や損傷の強弱、そして復旧プロセスの違いによっては、回収率が低くなることがあります。

←　Low

High →

Replaceability with Donor Part （ドナー部品との置換性）

HSA YES [ Head Stack Assembly ]Head Map, Capacity, Architecture Family, Microjog

SPM YES[ Spindle Motor ]Seizure Problem, Lubricating oil

PCB YES[ Printed Circuit Board ]Serial ROM, NV-RAM, Fuse, Resister, Diode, Capacitor, Coil, Microchip / Repairment is also useful

FW YES & NO[ Firmware ]Unique module, Non-unique module, Regeneratable module, Essential Module

Disk NO[ Platter ]Bad Sector, Scratch, particules on surface

Replaceability with Donor Part 　（ドナー部品との置換性）

HSA YES

SPM YES

PCB YES

FW YES & NO

Disk NO

Replaceability with Donor Part （ドナー部品との置換性）

HSA YES

SPM YES

PCB YES

FW YES & NO

Disk NOスラスト軸受

ジャーナル軸受

回転方向回転方向

潤滑油

溝

ディスク

Replaceability with Donor Part （ドナー部品との置換性）

HSA YES

SPM YES

PCB YES

FW YES & NO

Disk NO

Replaceability with Donor Part （ドナー部品との置換性）

HSA YES

SPM YES

PCB YES

FW YES & NO

Disk NO

SAService Area

UAUser Area

SA

SA

SA

SASA SA SA

SA

SA

SA

SA

SA

SASA

SASASA

SA

SA

Firmware = Service Modules

SA Modules are located on platters

Replaceability with Donor Part （ドナー部品との置換性）

HSA YES

SPM YES

PCB YES

FW YES & NO

Disk NOData is recorded into platters.

Replacement means nothing.

Replaceability with Donor Part

HSA YES [ Head Stack Assembly ]Head Map, Capacity, Architecture Family, Microjog

SPM YES[ Spindle Motor ]Seizure Problem, Lubricating oil

PCB YES[ Printed Circuit Board ]Serial ROM, NV-RAM, Fuse, Resister, Diode, Capacitor, Coil, Microchip / Repairment is also useful

FW YES & NO[ Firmware ]Unique module, Non-unique module, Regeneratable module, Essential Module

Disk NO[ Platter ]Bad Sector, Scratch, particules on surface

If unique parts are corrupt, there is no way to recover data

The Most Difficult problem is Platter Damage

3.5inch PATA

The Most Difficult problem is Platter Damage

2.5inch SAS

The Most Difficult problem is Platter Damage

The Most Difficult problem is Platter Damage

The Most Difficult problem is Platter Damage

For a long time, DR from scratched disk has been impossible

If the surface is partially damaged, there should be recoverable data in the areas which

were not damaged.部分的にしかキズが付いていないなら、

それ以外の部分にはデータは残っているはず、、、、、、

Why is it so difficult to read damaged surface ?

Let’s take an extreme close look at

Disk & Head !

Disk Surface & Slider

Flying Height

1-3 nm

3nm

1nmLubricant Layer 潤滑層Diamond Like Carbon Coating Layer コーティング層

Magnetic Layer 磁性層

Disk Rotation Direction →

1 ～ 3nm

Slider

スライダ

R/W Head

Slider

The gap between Head and Disk is very small

Flying Height1-3nm

Particle Size ofParticle Size ofCigarette SmokeCigarette Smoke

100-1000nm100-1000nm

How head crash damages the surface

Lubricant Layer

DLC Layer

Magnetic Layer

Slider R/W Head

Lubricant Layer

DLC Layer

Magnetic Layer

Slider R/W Head

Lubricant Layer

DLC Layer

Magnetic Layer

Slider R/W Head

Cause of malfunction of HSA when reading damaged surface

1. Scratch is not the main cause of the bad operation of Head Stack Assembly

2. Particles on the surface stick to sliders.

3. Slider’s flying becomes unstable because of the particles on the surface of the disk and the sliders.

So, Let’s clean the surface !

Disk Burnishing Process

NO　DUSTNO　PROBLEM

The 1st step of the research completed with a good result

0.02%

94%

UP !

Newspaper : Nikkei Business Daily, 26th Septempber 2013

Precise surface analyzing is required for better recovery

Optical Surface Analyzer

July 2012, research was started by Prof.Hiroshi Tani

Prof. Hiroshi Tani@ Kansai Univ.

What we can do BEFORE disater occurs

Physical Damage caused by Software ???ソフトウェアがハードウェアを壊す？？？

What is the HDD’s Boot Sequence ?

Start Finish

Let’s go to the finish line

together with everyone !

HDD’s Boot Sequence

PowerON Ready

Needs to complete each sequence,then can reach to “Ready” mode

User Area & Service Area

SAService Area

UAUser Area

SA

SA

SA

SASA SA SA

SA

SA

SA

SA

SA

SASA

SASASA

SA

SA

SA Modules

• P-List : Primary Defect List

• G-List : Growth Defect List

• Translator : LBA access ⇔ PBA access

• S.M.A.R.T.

Self-Monitoring Analysis and Reporting Technology

Defects

× ×

×

××

×

×

×

Defects info = Position of Bad Sectors in PBA

Defects info is Unique to each disk

× ×

×

××

×

×

×

×

×

×

× ×

×

×

××

×

×××

×

××

×

×

××

×

×

×

×

××× ×

P-List : Primary Defect List

G-List : Growth Defect List

Defects info is Unique to each disk

× ×

×

××

×

×

×

×

×

×

×××

× × × ×× × × ×

Number of Defects

PBA （物理アドレス）と LBA （論理アドレス）

LBA exists logically upon PBA. The following shows good sectors from address 0.

通常、“アドレス”や“セクタ”が指す対象は論理アドレスのこと。

下図は、欠陥セクタが無い正常なセクタが連続している領域の状態を示しています。

0 1 2 4 53

0 1 2 4 53

Physical Block Address 物理アドレス　→

Logical Block Address 論理アドレス　→

Defects Controlling （不良物理セクタの管理）

0 1 2 4 53

0 1 3 42

物理アドレス　→

論理アドレス　→

P-List Table

2・・・

Translator

Converter function between LBA and PBAIf the translator is broken, no data is accessible. One of the most important module.

論理アドレスと物理アドレスの変換テーブルこのデータが読めなければ、プラッタ上の全ての磁気データを読み出すことができたとしても、ファイルやフォルダは一切復旧できません。 SA モジュールの中でもトップクラスの重要度です。

PBA物理アドレス

LBA論理アドレス

0001

0687

1968

3786

9821

0001

0508

3544

9871

0051

Access RequestFrom Hostホストからのアクセス要求Access to the physically

Assigned positionプラッタ上の指定エリアにアクセス

SA Modules are loaded into PCB

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

Complete(^o^)

When SA Modules loading completes fine

PowerON Ready

LBA Zone

Wow , I did it !I have access to all

data !

やった！LBA 全域アクセス

できるぞー！

Damage of SA Module

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

Error ！Can’t Read

OrModule is corrupted

ABORT

Damage of SA Module : No LBA Access

PowerON Ready

LBA Zone

I can’t access LBA zone, because there was a SA module

error.

The data should be in LBA Zone, but I can not access LBA 0

SA モジュールに異常があったから、 LBA 領域にアクセスできない。 HDD にはデー

タあるはずなのにな。

NO　SANO　DATA

If the SA module error was caused intentionally by ,,,,,

もし、誰かがわざと SA モジュールに異常を生じさせたら、、、

Intentional Damage to SA module

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

Intentional Damage to SA module

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

Damage of SA Module : No LBA Access

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

Error ！Can’t Read

OrModule is corrupted

Intentional Damage to SA module

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

Error ！Can’t Read

OrModule is corrupted

Damage of SA Module : No LBA Access

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

SAModule

Error ！Can’t Read

OrModule is corrupted

ABORT

BARUSER

Let’s see what happens to HDDさあ、実際にやってみましょう

BARUSER

BARUSER = BARUSU + ER

Main Concept of HiDR ( High Integrity Data Recovery )

SA モジュールは百種以上！

このサンプル事例では、

WD10EADS-22M2B0 　を使用。

SA モジュール数は全部で 397 種

Main Concept of HiDR ( High Integrity Data Recovery )

このサンプル事例では、

WD10EADS-22M2B0 　を使用。

SA モジュール数は全部で 397 種

必須かつユニークなのは 7 種

7 ÷ 397 ≒ 　 1.76%

Main Concept of HiDR ( High Integrity Data Recovery )

Only 1.76%

Hot Swap Method ： ホットスワップ手法

通電した状態のまま、 Patient に PCB を付け替えます。

通電したまま

Main Concept of HiDR ( High Integrity Data Recovery )

未開封、ヘッド交換なしでＩＤ認識しないＨＤＤでもデータが読める

必要最低限のモジュールアクセスだけで済む

障害部位を確実かつ詳細に把握し、尚且つデバイスの特徴を予め研究調査しておくことで、より安全かつ多くのデータを回収することができる。

クリーンエア環境下とはいえ、開封時には異物が混入することは避けられない。クリーンルームが絶対にキレイとは限らない。

Non-Destructive Method even for HDD which doesn’t give its device ID.

The least access to the magnetic disk for its booting is enough for data recovery.

It is good to know the details of SA modules because the integrity of data recovery process becomes very high.

Do not rely too much upon clean rooms because inside of the clean room is not always clean.

Security or Utility

Hacked Cracked

Good forData leakage preventing

ＶＳ Bad forFuture data use

HDD customization against Future SA Damage

Head 0Head 1

Head 2Head 3

Head 4Head 5

PlatterHead

Head Map

HDD customization against Future SA Damage

Head 0Head 1

Head 2Head 3

Head 4Head 5

System Head

PlatterHead

HDD customization against Future SA Damage

Head 0Head 1

Head 2Head 3

Head 4Head 5

System Disk

PlatterHead

HDD customization against Future SA Damage

Head 0Head 1

Head 2Head 3

Head 4Head 5

SA exists only on the system disk, h0 and h1

SA Region for h2,h3,h4,h5 are empty

PlatterHead

HDD customization against Future SA Damage

Head 0Head 1

Head 2Head 3

Head 4Head 5

Utilize the empty zone for SA backup !

PlatterHead

http://www.disaster-data-recovery.com/

Initial Response GuidelineFor Disaster Effected HDD

1. Do NOT Power ON !

電気を入れない！

２． Do NOT Dry before cleaning !

洗浄前に乾燥させない！

３． Sea Water should be removed ASAP !海水で腐食は待ったなし！

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