Member Avatar for raysalaf

the problem i have replaced my knackered dvd/cd drive with identical model no,[uj-820b] which i purchased from ebay.when booted no ide error appears, then windows loads but no drive shown in my comp, nor in device manager.then i check bios there it is i put into standby mode drive then can be seen in my comp and device manager, and can be used. checked for firmware no luck could this be the master/slave prob, and will i have to revert to shorting pins 45 and 47 to allow a bootable drive.......please advise.

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Dani AI

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Brief recap and context: replaced the laptop's internal optical unit and observed that the firmware sees the device, but the OS does not list it until after a suspend/resume. reported a hardware-ID/jumper-style fix worked in a similar case, but that approach is fiddly and carries risk.

Try these troubleshooting steps in this order (safer measures first):

  • Verify connectors and fit: confirm the replacement is the correct slimline interface, check the drive and bay contacts for bent pins or debris, and clean contacts with isopropyl if needed. Poor seating or damaged contacts is a common cause of intermittent detection.

  • Isolation test: verify the drive behavior in a second compatible machine or with a slimline-to-external adapter/caddy. If it behaves the same elsewhere, the drive is likely the issue; if it works elsewhere, the laptop connector or firmware is suspect.

  • Windows-side fixes:

    • In Device Manager use View > Show hidden devices, remove any ghost/unknown DVD/CD entries, then Action > Scan for hardware changes.
    • Under IDE/ATA controllers, uninstall the channel entries (Windows will reinstall them on reboot) to force reinitialization.
    • Registry fix (backup first): remove only the UpperFilters and LowerFilters values under
      HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} and reboot. This resolves many situations where the OS does not enumerate optical drives.

  • Firmware and drivers: update the laptop chipset drivers and BIOS before attempting drive firmware updates. Drive firmware updates are model-specific; apply only an exact-match firmware from a trusted source.

  • BIOS settings and power-up timing: look for any optical/hot-plug or legacy IDE compatibility options in firmware. The symptom of appearing only after resume often points to power-up or negotiation timing, not a file-system problem.

Final notes and cautions: changing a drive's ID by bridging jumpers or pads can work but is delicate, can damage the unit, and may void warranties — leave it to someone experienced. A low-cost external USB DVD drive or sourcing a guaranteed OEM replacement is often the safer, faster solution.

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Member Avatar for caperjack

will i have to revert to shorting pins 45 and 47 to allow a bootable drive.......please advise.

that was the only way i could get a toshiba drive work in a Dell laptop

commented: made my mind up. +0
Member Avatar for raysalaf

thanks, caperjack. thought that may be the only answer although may have to get someone else to do it as my eyesight is bad, can hardly see the pins to do the job.

Member Avatar for caperjack

thanks, caperjack. thought that may be the only answer although may have to get someone else to do it as my eyesight is bad, can hardly see the pins to do the job.

lol. i hear ya ,i use a magnifying glass!just bent it over till it touched ,never did solder it

Member Avatar for raysalaf

ok, give that a try. when i can pluck up enough courage .

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