Data recovery and disk repair questions and discussions related to old-fashioned SATA, SAS, SCSI, IDE, MFM hard drives - any type of storage device that has moving parts
July 8th, 2015, 10:57
Hello ,
I Wanted To Discuss a Case Currently At Hand .This HDD Was Given To a Normal Computer Chip Level Mechanic By One Of My Dealers Friends .Once The HDD Came Back To The Dealer And Into My LAB The Rom Chip Was Missing Along With a TVS .I Told The Same To The Dealer And I am Afraid That The Guy Now Has a Random IC Installed By The Repair Tech .I Do Not Have Another HDD To Verify This .Can Someone Let Me Know If This is a ROM Or a NVRAM In This Family .The Chip Number Thats Now Installed Is FM24C02 " More Likely a NVRAM " . If Anyone Wanted i Can Pull It Out And Read Contents With a External Flash Programmer .I Do Not Want To Risk The Drive By Powering It Until i Do Not Have a Idea On This One Please
July 8th, 2015, 14:28
Show a photo.
July 9th, 2015, 11:42
pcimage wrote:Show a photo.
Hello Sean ,
I Will do That Tommorow At Lab .I Have a Similiar MCU PCB of Hitachi Not Same Family That Has 25 Series IC Not 24 Series .Hence So Confused
July 9th, 2015, 15:11
24C02 is an "NVRAM". For a start, it's not big enough to store the "ROM" code. Also, the location and circuit reference should be an obvious giveaway.
July 9th, 2015, 23:29
fzabkar wrote:24C02 is an "NVRAM". For a start, it's not big enough to store the "ROM" code. Also, the location and circuit reference should be an obvious giveaway.
Frank ,
Thanks Boss I Am Gonna Take This Out And Then Read It Via External Reader And Check If Its Indeed NVRAM Then i Will Try And Power This Up Otherwise Its Going Back To Client .Its a ARM Series Hence No Rom Regeneration Would Be Possible " If Indeed it Got ROM and Not NVRAM " .Lets See I Will Keep You Fellow Posted
July 9th, 2015, 23:41
The 24xx chips are microwire EEPROMs whereas my understanding is that Hitachi uses 93xx series EEPROM chips for NVRAM. These have completely different pinouts, including different power pins, and different communication protocols.
The chip in this image ...
http://ep.yimg.com/ay/yhst-144375849714 ... d-fw-3.gif... is a 25xx SPI flash memory.
The 24C02 has a size of 256 bytes (= 2K-bit) whereas the Pm25LD020 is a 256K-byte chip.
July 10th, 2015, 0:16
fzabkar wrote:The 24xx chips are microwire EEPROMs whereas my understanding is that Hitachi uses 93xx series EEPROM chips for NVRAM. These have completely different pinouts, including different power pins, and different communication protocols.
The chip in this image ...
http://ep.yimg.com/ay/yhst-144375849714 ... d-fw-3.gif... is a 25xx SPI flash memory.
The 24C02 has a size of 256 bytes (= 2K-bit) whereas the Pm25LD020 is a 256K-byte chip.
Frank ,
You Are Totally Correct .The Bugger In The Other Company Has Possibly Mixed The Damn Thing .I do Not Think Its Wise To Carry Forward With The Case .
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