Windows 7 - HDDs not recognised.

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I have seen a few answers to this problem and each one involves formatting the HDD. I have two external HDDs with lots of data on them. I really don't want to format these. Is there any way I can get at my data please? Thanks.

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Your new hard drive is disabled in BIOS, the OS won't be able to detect it and it won't show up in Windows. Hence, checking whether your hard drive is disabled in BIOS is also necessary. Restart your computer and press the BIOS key (depending on the computer you use) until you enter BIOS
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Does it show up under "Device Manager" -> under disk drives? If the disk shows, what is the state of the drive? Does it show the correct storage space?
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You can make it clear why the HDD is not recognized by doing some basic checks: https://iboysoft.com/data-recovery/external-hard-drive-not-showing-up.html
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Hi, use the disk management tool and check your drive is showing there or not. In the disk management window, a list of all the connected external drives and the existing ones along with their complete details will be visible.

Secondly, if the drive is not showing up in the disk management tool then first check the USB port. Try to plug your targeted drive in another USB port on your computer. You can also update the driver sometimes outdated drive makes problem.

In case the drive is partitioned, but still, you can’t access the drive from another device, then probably it is not formatted as NTFS. At times many devices can’t read the Windows NTFS file system. To fix this problem format the drive with the FAT32 files system.

Last but not least, you can format the drive, but as you said you have a lot of data in your external hard drive. Try some data recovery software like Recuva or Stella Data Recovery Professional, these utilities are able to recover deleted data formatted hard drive data, lost partition data efficiently. Probably it may help you to retrieve data. Or you may reach to your nearest professional data recovery service centers. Thanks
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These suggestions sound as if at least one of them will solve my problem but I'm afraid I don't know enough about setup etc. to follow them. If I put down what I see in Disk Management, could someone make sens of that for me. Will the other helpers be able to see this, or will I have to send it to each one?
This is what I see -
Disk Drives
ATA Hitachi HUA72303 SCSI Disk Device
ATA ST32000542AS SCSI Disk Device
HP ENVY 5640 Series USB Device (Obviously my printer)
LITEON UITRA USB Device

DVD/CD-ROM drives
HL-DT-ST DVDRAM GH22LS50 SCSI CdRom Device
Hp DVD A DA16AAL SCSI CdRom Device

Universal Serial Bus ccontrollers
USB Composite Device
USB Composite Device
USB Mass Storage Device
USB Mass Storage Device
I'm afraid I couldn't make much sens of the BIOS setup either.

Thanks so much for this help.