sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

Technology does not stand still. More and more new drives of all types
with new features appear every year. And they all do break just as well.
Let’s talk about SSHD – the most popular device in data recovery

What exactly is SSHD drives and how do you work with them?

Welcome to this article.

SSHD drives are general HDD drives with NAND chip (SLC – first
generation SSHD drives or MLC – modern SSHD drives) on the PCB. This
NAND chip is used for fast booting and mounting of the drive and
contains the most often addressed data (like a microprogram info,
translator, SMART, OS structures and partition tables). The exact list of this data differs from one manufacturer or model to another

As of today, SSHD drives are presented by Western Digital, Seagate and Toshiba brands.

大约5年前Seagate公司 开始制造具有媒体缓存区域的驱动器。这个区域与我们现代的SSHD驱动器非常相似。
Approximately 5 years ago Seagate corp. started to manufacture drives
with Media cache area. This Area is very much the same to our modern
SSHD drives.

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特殊区域(媒体缓存)位于拼盘边缘(读/写速度最高)。它存储最经常寻址的数据(文件系统结构,操作系统重要文件等)。媒体缓存位于表面,为了恢复数据,使用媒体缓存问题,通常只需要清理它(它是346 系统文件)。
Special area (Media cache) is located on the platter’s edge (where the
reading/writing speed is the highest). It stores a most often addressed
data (File system structures, OS important files, etc.). The media cache
is located on the surface, and for recovering cases, with Media cache
issues it’s usually enough just to clean it up (it’s 346 sys file).


Note that modern family drives (like Rosewood) can have some unique
data, like MFT tables, in Media cache, not in a general user area space.
So, when working on them, make a backup of 346 sys files each time
before cleaning attempt.

SSHD drives are the most complex of the storage devices and require sophisticated methods for solving the issues that may arise.

Hybrid drives technology has pros and cons inherent in both technologies
separately (SSD and HDD). Firstly we have a basic problem with moving
parts (heads, spindle, surface), the secondary problems are related to
the  Service area modules and Translation, and finally, there are issues
related to NAND chip (memory cells wear off, ECC errors in data,
temperature issues, etc..).

Let’s separate the NAND-chip part from the general HDD. As a result, we
get basic HDD problems, similar to those of the general Seagate drives,
and NAND problems.

For example here is a photo of Kahuna family drive PCB:

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

There are a lot of articles on how to work with general Seagate HDD
(like a damaged sys files, ticks in 93 sys file and translator issues).
But what about NAND chip?

We still have a terminal report after Power ON. It can help us to
recognize a problem, but terminal access is locked as result we can’t
send command via Terminal.

Firstly need somehow get a terminal access.

For this we need to block drive initialization process, actually we need
to modify a ROM chip. So read a ROM chip by Boot Code mode:

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

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Save it into backup profile folder (It’s very important!) 

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Then use a “Kahuna patch” option from the right side of the utility window (1st and 2nd steps) and write this ROM into the ROM chip (step 3):

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

Wait a while for the writing to proceed, and check the status in the Log tab:

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

When the process is completed repower the drive…

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

…并尝试通过按ctrl + Z 获得终端访问:
…and try to get a Terminal access by pressing ctrl+Z:

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

+ X命令检查系统文件,对重要的系统文件进行手动备份(28,35,93
As you can see the Terminal mode is now available and ready to receive
and execute your commands. Note that the drive is not fully initialized,
and in registers you can see a different LEDs. Don’t pay attention to
these LEDs for now. Drive is not available via ATA, and we have only a
terminal mode, but we can perform any diagnostics with general HDD:
like check a system files by Ctrl+X command, make a manual backup of
important system files (28, 35, 93, 1B, 135 etc), regenerate a
Translator (if needed!), remove a ticks in 93 sys file (SMP flags) and

Before proceeding make a backup of the system file that you are going to modify! 

For every case it is advisable to remove ticks in 93 sys file (SMP flags):

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

After performing full diagnosis you need to reinitialize a NAND chip to
actualize (refresh) the data. This operation requires a special terminal

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The terminal report can be either short or very long. It’s not important, just wait until you get a Terminal response.

If you get the following terminal report:

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

It means the drive has a hardware problem with NAND chip. You need to
set a donor PCB with the patient ROM chip then send a NAND
initialization command again.

After completing NAND reinitialization you need to write back the
original ROM dump (that you did not forget to backup, didn’t you?). Open
this ROM.bin file from backup profile folder:

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

…and write it by Boot code mode:

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Wait while the terminal reports of success:

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

…and repower the drive. Re-read Drive ID and check the user area access:

sshd混合硬盘nand芯片故障硬盘通电不转数据恢复方 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

As a result, you get an access to the user area and can now read all user data.

未经允许不得转载:苏州盘首数据恢复公司 » 希捷SSHD混合硬盘NAND芯片故障,硬盘通电不转,数据恢复方案

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