使用PC-3000 SSHD混合硬盘NAND芯片故障数据恢复方案

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 branch.

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.

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:

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:

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

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):

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

When the process is completed repower the drive…

…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:

您可以看到终端模式现在可用,并准备好接收和执行命令。请注意,驱动器未完全初始化,在寄存器中可以看到不同的LED。现在不要注意这些LED。驱动器不能通过ATA使用,我们只能使用终端模式,但是我们可以使用通用硬盘进行任何诊断:比如通过Ctrl + 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 ,1B,135等),重新生成一个翻译器(如果需要的话),删除93系统文件(SMP标志)等。
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 other.

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):

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

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:

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:

…and write it by Boot code mode:

Wait while the terminal reports of success:

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

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

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  1. 这是一篇好文章,正好手上有一个这样的硬盘,感谢楼主的分享
    huangzhen2017-11-02 14:00
  2. 每次看到这种硬盘都不知道如何处理
    huangzhen2017-11-02 14:02
  3. 谢谢分享技术文章。。
    kk6012017-11-11 20:45
  4. 终于可以注册登录,感谢千喜!!
    lgzgd2017-12-13 12:51
  5. 谢谢分享谢谢分享谢谢分享
    wang2784575322017-12-20 16:43
  6. 正好手上有一个这样的硬盘 感谢楼主的分享
    myloveliujie2017-12-23 11:07
  7. 感谢楼主分享好文章。
    cf79593672018-01-07 21:38
  8. 谢谢分享技术文章。。
    mainvod12018-01-19 10:41
  9. 感谢分享技术好贴,正在学习的小白
    dongzi10292018-01-25 20:12
  10. 这么好的文章一定要看看谢谢楼主分享
    fkuedcyq2018-01-29 10:34
  11. 很好的文章,学习一下。感谢分享。
    cham_8102018-03-07 12:08
  12. 这是一篇好文章,正好手上有一个这样的硬盘,感谢楼主的分享
    qweasd1119992018-03-21 14:23
  13. 这是一篇好文章,正好手上有一个这样的硬盘,感谢楼主的分享
    uumen2018-03-27 13:46
  14. 谢谢分享技术文章。。
    lenovowugs2018-05-03 17:56
  15. 这是一篇好文章,正好手上有一个这样的硬盘,感谢楼主的分享
    10744841192018-05-14 12:51
  16. 不错的案例,赞 🙄
    DLDLDLDL2018-05-24 15:49
  17. 很好的技术文章,支持!!!!
    qcyxp2018-06-02 17:01
  18. 快让我张张见识!学习学习 :mrgreen: :mrgreen:
    jekey2018-06-18 14:21
  19. 这是一篇好文章,正好手上有一个这样的硬盘,好好学习
    1821811482018-08-27 22:25
  20. 谢谢分享 难得的好文章啊
    imovie2018-09-15 13:50
  21. 对我帮助很大,多谢多谢多谢
    wgm16882019-01-26 22:21
  22. 每次看到这种硬盘都不知道如何处理
    at20192019-02-23 22:45
  23. 谢谢分享谢谢分享谢谢分享
    138473060082019-08-31 22:35
  24. 谢谢分享技术文章。。
    666666666666666666662020-09-25 12:04
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