miniscribe 8425SA scsi

[Alandata Recovery]

I have a vintage scsi drive for recovery

its got a burnt cap on the main board

where can I find a single cap like this

thanks

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Alandata Data Recovery -  (949)287-3282  
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[pbzcbf...@gmail.com]

It appears to be a 22uF, 16V tantalum (made by Kemet?). You should be able to replace it with an equivalent electrolytic.

[pbzcbf...@gmail.com]

https://electronics.stackexchange.com/questions/176855/burned-out-tantalum-capacitor-replacements

[pbzcbf...@gmail.com]

There appears to be a fuse F1 at one end of the SCSI connector.

BTW, I think the manufacturer of the capacitor is AVX, but that doesn't change anything.

On Thursday, September 29, 2022 at 1:27:09 PM UTC+10 pbzcbf...@gmail.com wrote:

[juanvd...@gmail.com]

Also test for a short on the pcb cap pins after you removed the faulty cap maybe there is another short on the unit.

 

Juan

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[Alandata Recovery]

Ok thanks

I noticed the giant fuse and it's . 3 ohms.

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[wayne horner]

there is no short at that cap.

Alandata Data Recovery -  (949)287-3282  

"Cleanroom Data Recovery of RAID, VMware, Network Attached Storage, Linux, Tape, Disk, Forensics"

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[pbzcbf...@gmail.com]

Try installing jumper "F".  If the drive goes through its seek tests, then this would suggest that the drive may be waiting for a start command from the host.

https://stason.org/TULARC/pc/hard-drives-hdd/miniscribe/M8425S-21MB-3-5-HH-SCSI1-SE.html

Jumper F 

Invokes Offline Diagnostics following reset, which consists of infinite seek tests (random or oscillating). 

[pbzcbf...@gmail.com]

Diagnostic and Exercise Routines
--------------------------------
The microprocessor performs wake up diagnostics upon application of power. If an error is detected, the processor will flash a warning by blinking the activity LED. Some errors are fatal in that they do not return to the program until power is cycled.

If no errors are detected, the processor tests Jumper E to determine its state (open or closed). Briefly, Jumper E (Drive Exercise Options) is as follows:

Power-up sequence of events is as follows:

1. Apply power

2. The microprocessor runs power on diagnostics and then allows motor spin up. 3. Test Jumper E. If open, go to normal operation. If closed, continue to Step 4.

4. Display code level (5 bits), e.g. 00001

5. Recalibrate access, then seek to maximum cylinder.

6. At this point the sequential seek burn-in will begin.

Error codes may be generated by the microprocessor to indicate hardware failures or warnings that are detected during power-on diagnostics, burn-in mode, or normal operation. Error codes are diaplayed in a "morse-code" type manner. Bits may be interpreted and converted into hexadecimal error codes. "Zeros" are indicated by a short (1/2 second) flashingn mode. "Ones" are indicated by a short (1/2 second) continuous ON mode. Error "Words" are separated by a one second LED off time.

Zero = 0.5 second flashing mode One = 0.5 second continuous ON mode Between Bits = 0.3 second Off Between Repeat Cycles = 1.0 second Off

Listed Below are the binary to hexadecimal conversion values:

0 = 0000 4 = 0100 8 = 1000 C = 1100
1 = 0001 5 = 0101 9 = 1001 D = 1101
2 = 0010 6 = 0110 A = 1010 E = 1110
3 = 0011 7 = 0111 B = 1011 F = 1111

Message Definitions
-------------------
Code 0 - Microprocessor RAM error
Code 1 - Microprocessor ROM checksum error
Code 2 - Interface chip diagnostic failure
Code 3 - Write Fault latch will not reset
Code 4 - Index pulse not detected during spinup
Code 5 - Unable to reach 3600 rpm in 600 revs.
Code 6 - Unable to stabilize spin speed in 10 seconds
Code 7 - Unable to maintain spin speed to 0.5%
Code 8 - Unable to uncover Track Zero sensor
Code 9 - Unable to cover Track Zero sensor
Code A - Track Zero interrupter misadjusted
Code B - Shipping zone error, crash stop misadjusted
Code C - Carriage stuck during recal error
Code D - Seek errror during burn-in or recal
Code E - No hall transitions during spin-up
Code F - Unexpected interrupt from processor

[Alandata Recovery]

on power I hear a lite click 

sounds like a head lock relay unlocking.

the led lights up

doesnt spin

no blink codes

adaptec issues bus reset or spin up

and led goes off

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[pbzcbf...@gmail.com]

Did you install diagnostic jumper E, as per the instructions?

On Friday, September 30, 2022 at 6:34:31 AM UTC+10 Alandata Recovery wrote:

no blink codes

[Alandata Recovery]

yes

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[pbzcbf...@gmail.com]

I expect it would make no difference, but it might be best to disconnect the SCSI interface during diagnostic testing. I suspect that the 2-pin connector at the front of the drive is probably set aside for an external activity LED. A lot of drives of that era were set up like that.

I would place my finger on the drive band of the stepper motor to see if it twitches.

I expect that Q3 (TIP120) would be involved in driving the spindle motor, so it might be worth seeing what volts are present on its pins. I expect that Q1 and Q2 would be involved as well.

[Alandata Recovery]

yes the 2 pin was the led

after a while the board warms up

not hot but its alive

tried with scsi and without

no twitching....

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[pbzcbf...@gmail.com]

The largest IC appears to be the main controller. It senses the jumper block. If the drive behaves differently when the jumpers are changed, then that would suggest that this MCU is not brain dead, which in turn would suggest that the 5V supply and crystal are OK.

I can't understand why there are no flash codes, unless the EPROM/OTPROM (U12) is faulty. :-?

I found some datasheets:

TEA3717DP / TEA3717A, SGS-Thomson / Thomson Semiconductors, stepper motor phase driver, 5V logic, 10V - 40V motor, PowerDIP-12+2+2:
http://www.elektronikjk.pl/elementy_czynne/IC/TEA3717-2.pdf

1N5353A / 1N5353B, ON Semiconductor, 16V 5W Zener:
https://www.onsemi.com/pdf/datasheet/1n5333b-d.pdf

http://eicsemi.com/DataSheet/1N53_A.pdf

TIP120, Motorola, NPN Darlington, 60V, 5A, hfe = 1000, TO-220:
https://www.st.com/resource/en/datasheet/tip120.pdf

IRFD123, Motorola, N-ch enhancement mode TMOS FET, 60V, 1.1A, DIP-4:
https://datasheet.datasheetarchive.com/originals/distributors/Datasheets-32/DSA-637194.pdf

AIC-010FL, Adaptec, Programmable Storage Controller for ST412/506, ESDI, ST412HP, SA1000 & SMD interface HDDs, 5V, PLCC-44:
https://datasheet.datasheetarchive.com/originals/distributors/Datasheets-111/DSAP0027214.pdf

HD63B03R1CP, Hitachi, 8-bit 2MHz CMOS MPU, Vcc = 3V - 6V, CP-52:
https://download.datasheets.com/pdfs/2004/0423/semi_ap/cs/ren/ds/hd63a03r.pdf

74LS373DW / DM74LS373WM, Texas Instruments / National Semiconductor, Octal D-Type 3-STATE Transparent Latch, SOIC-20:
http://www.mouser.com/ds/2/308/dm74als373-1116753.pdf

DM7406M, National Semiconductor, Hex Inverting Buffers, O/C outputs, 5V, SOIC-14:
http://www.farnell.com/datasheets/303946.pdf

0404-1930-01, Belfuse, delay line

[jol qwerr]

<Quote: "on power I hear a lite click 

sounds like a head lock relay unlocking" End quote>

Just a hint

Back then - with old drives - it wasnt uncommon for the heads to fall of the platters

the good thing with those giant heads is that most of the times, just putting the heads back was solved the problem (didnt even need a replacement)

[pbzcbf...@gmail.com]

The docs don't seem too clear, but jumper E could be a burn-in jumper. Perhaps it's best avoided. :-?

[wayne horner]

I rotated the body and can hear the platters move freely.

Good thing drive didn't spin with e jumper...

On Fri, Sep 30, 2022, 7:11 PM pbzcbf...@gmail.com <pbzcbf...@gmail.com> wrote:

The docs don't seem too clear, but jumper E could be a burn-in jumper. Perhaps it's best avoided. :-?

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[Alandata Recovery]

WahoO!

I received another miniscribe for testing.

Plugged in and same behavior - no spin.

Checked board and the same component was getting hot.

Powered off and swapped boards.

When I removed the board you can see the motor on the outside of the case.

My customers moved freely (mostly) but the new donor was pretty stiff.

I manually rotated it and it got looser.

I think the lack of spin is what was cooking the component.

Swapped donor board to patient and eventually is detected but was getting scsi errors.

The stepper motor that moves the heads was also stiff and trying to move but couldn't move easily.

I could feel it buzzing and trying to move, so I gave it a little boost and it started moving.

While it was spinning I manually worked the stepper motor and it gradually freed up and the drive started seeking around.

Booted linux and with ddrescue made a 99.98% image of the 20mb drive 3708 bads.

WahoO!

but now its a BD filesystem signature.

I think it might be MFS the precursor to HFS.

What can recover / mount MFS?

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[pbzcbf...@gmail.com]

I did some searching and it appears that the "BD" signature is associated with HFS. HFS was released in 1985. According to Wikipedia, 20MB was the maximum capacity for MFS volumes.

[Alandata Recovery]

I'll try it as hfs

On Tue, Oct 11, 2022, 9:28 PM pbzcbf...@gmail.com <pbzcbf...@gmail.com> wrote:

I did some searching and it appears that the "BD" signature is associated with HFS. HFS was released in 1985. According to Wikipedia, 20MB was the maximum capacity for MFS volumes.

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[Alandata Recovery]

OK rstudio recognized the image as HFS

But the files look weird - no extensions.

Looks like the first part of the file is the resource fork

Here is space command letter - which must be a letter - but I dont know what app created or opens it.

I suspect its word for mac.... ancient edition

[Alandata Recovery]

funny

UFS explorer doesnt see it or scan for HFS

[jpv...@gmail.com]

Does this help?

------ Original Message ------

From: "pbzcbf...@gmail.com" <pbzcbf...@gmail.com>

To: "DataRecoveryCertification" <datarecovery...@googlegroups.com>

Sent: 10/12/2022 5:24:57 AM

Subject: Re: miniscribe 8425SA scsi

I can try to reverse engineer the file system, if necessary. I've done it before for file systems of that era.

What can recover / mount MFS?

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[pbzcbf...@gmail.com]

Are there any executable files on the drive? Is the drive meant to be bootable?

[pbzcbf...@gmail.com]

7Zip claims to be able to extract files from an HFS image. You may need to strip the first 16K or 48K bytes, though.

https://sourceforge.net/p/sevenzip/wiki/Home/

" 7-Zip is a file archiver with the high compression ratio. The program supports 7z, XZ, BZIP2, GZIP, TAR, ZIP, WIM, ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR, Z."

[Alandata Recovery]

thanks for the mfs layout

there is no d2d7 signature  - so not MFS

Rstudio sees it as HFS - 

I extracted the files and they are consistent.

So HFS has resource forks.

rstudio merges the resource forks and the files.

7ziip would not open it even after cutting the the leading areas.

isobuster did the best, it had multiple options for handling resource forks as macbinry

or merged

or separating forks with .R extension

attached the image to mac catalina

it sees the drive as partitions

and even recognizes the hfs partition

but wont mount it

its not running fsck on it.

but mount get disinter error 49153.... macs useless error message

thanks for the tips everyone.

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[pbzcbf...@gmail.com]

Interesting job. Would you mind uploading the first 97 sectors? That's 48KB plus 1 sector. I think that should contain metadata only, but you might want to make sure.

[pbzcbf...@gmail.com]

I examined the FS dump and it looks like a regular HFS volume. 

https://github.com/libyal/libfshfs/blob/main/documentation/Hierarchical%20File%20System%20(HFS).asciidoc

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000  4C 4B 60 00 00 86 00 17 00 00 06 53 79 73 74 65  LK`..†.....Syste  <-- LK signature
00000010  6D 20 20 20 20 20 20 20 20 20 06 46 69 6E 64 65  m         .Finde
00000020  72 20 20 20 20 20 20 20 20 20 07 4D 61 63 73 62  r         .Macsb
00000030  75 67 20 20 20 20 20 20 20 20 0C 44 69 73 61 73  ug        .Disas
00000040  73 65 6D 62 6C 65 72 20 20 20 0D 53 74 61 72 74  sembler   .Start
00000050  55 70 53 63 72 65 65 6E 20 20 0B 4D 75 6C 74 69  UpScreen  .Multi
00000060  46 69 6E 64 65 72 81 00 00 42 0E 43 6C 69 70 62  Finder...B.Clipb
00000070  6F 61 72 64 20 46 69 6C 65 20 00 0A 00 14 00 00  oard File ......

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000  42 44 A0 FF AD 7F B1 D2 26 16 01 00 00 02 00 03  BD ÿ..±Ò&.......  <-- BD signature
00000010  33 7D 98 26 00 00 02 00 00 00 08 00 00 0D 00 00  3}˜&............
00000020  21 1C 22 E4 01 31 41 52 44 20 44 49 53 4B 44 20  !."ä.1ARD DISKD
00000030  44 49 53 4B 00 00 00 00 00 00 00 00 00 00 00 00  DISK............
00000040  00 00 00 00 00 00 00 05 33 32 00 02 60 00 00 02  ........32..`...
00000050  60 00 00 1D 00 00 03 81 00 00 00 2A 00 00 00 11  `..........*....
00000060  00 00 00 11 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000070  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000080  00 00 00 02 60 00 00 00 01 30 00 00 00 00 00 00  ....`....0......
00000090  00 00 00 04 C0 00 01 30 01 30 6D 5C 01 30 00 00  ....À..0.0m\.0..

It appears that the pro tools prefer to concentrate on HFS+.

There are 4 partitions, one for data.

https://en.wikipedia.org/wiki/Apple_Partition_Map

The architecture appears to be Motorola 68000.

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000000  50 4D 00 00 00 00 00 04 00 00 00 60 00 00 98 35  PM.........`..˜5
00000010  4D 61 63 4F 53 00 00 00 00 00 00 00 00 00 00 00  MacOS...........
00000020  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000030  41 70 70 6C 65 5F 48 46 53 00 00 00 00 00 00 00  Apple_HFS.......
00000040  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000050  00 00 00 00 00 00 98 35 00 00 00 B7 00 00 00 00  ......˜5...·....

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000200  50 4D 00 00 00 00 00 04 00 00 00 01 00 00 00 3F  PM.............?
00000210  41 70 70 6C 65 00 00 00 00 00 00 00 00 00 00 00  Apple...........
00000220  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000230  41 70 70 6C 65 5F 70 61 72 74 69 74 69 6F 6E 5F  Apple_partition_
00000240  6D 61 70 00 00 00 00 00 00 00 00 00 00 00 00 00  map.............
00000250  00 00 00 00 00 00 00 3F 00 00 00 37 00 00 00 00  .......?...7....

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000400  50 4D 00 00 00 00 00 04 00 00 00 40 00 00 00 20  PM.........@...
00000410  4D 61 63 69 6E 74 6F 73 68 00 00 00 00 00 00 00  Macintosh.......
00000420  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000430  41 70 70 6C 65 5F 44 72 69 76 65 72 00 00 00 00  Apple_Driver....
00000440  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000450  00 00 00 00 00 00 00 20 00 00 00 7F 00 00 00 00  ....... ........
00000460  00 00 13 22 00 00 00 00 00 00 00 00 00 00 00 00  ..."............
00000470  00 00 00 00 00 00 BC C6 36 38 30 30 30 00 00 00  ......¼Æ68000...  <-- Motorola 68000
00000480  00 00 00 00 00 00 00 00 00 01 05 00 00 00 00 00  ................
00000490  00 00 00 01 00 07 C0 06 00 00 00 00 00 00 00 00  ......À.........

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000400  50 4D 00 00 00 00 00 04 00 00 00 40 00 00 00 20  PM.........@...
00000410  4D 61 63 69 6E 74 6F 73 68 00 00 00 00 00 00 00  Macintosh.......
00000420  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000430  41 70 70 6C 65 5F 44 72 69 76 65 72 00 00 00 00  Apple_Driver....
00000440  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000450  00 00 00 00 00 00 00 20 00 00 00 7F 00 00 00 00  ....... ........
00000460  00 00 13 22 00 00 00 00 00 00 00 00 00 00 00 00  ..."............
00000470  00 00 00 00 00 00 BC C6 36 38 30 30 30 00 00 00  ......¼Æ68000...
00000480  00 00 00 00 00 00 00 00 00 01 05 00 00 00 00 00  ................
00000490  00 00 00 01 00 07 C0 06 00 00 00 00 00 00 00 00  ......À.........

[pbzcbf...@gmail.com]

I forgot this partition.

Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00000600  50 4D 00 00 00 00 00 04 00 00 98 95 00 00 07 97  PM........˜•...—
00000610  45 78 74 72 61 00 00 00 00 00 00 00 00 00 00 00  Extra...........
00000620  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000630  41 70 70 6C 65 5F 46 72 65 65 00 00 00 00 00 00  Apple_Free......
00000640  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
00000650  00 00 00 00 00 00 07 97 00 00 00 37 00 00 00 00  .......—...7....