external drive in Devices but not in Explorer

Beldar said:

maintain low tones with me, but consume mass quantities

“Perhaps you and Larry will join us for the consumption of mass quantities this weekend… will we ignite our new flame pit and char some mammal flesh for you.”

Was the data you want to recover installed in the drive under Windows or under Linux?

@Balder

We will of course go slow. I also have other things to do.

And so you have one self-assembled Desk top with Windows 7 on it (PC1) and another Lenova Thinkpad laptop (PC2) also running Win 7. Right?

OK,I have this thing to say. Always post a full screenshot showing all the Internal and connected external drive and not a truncated screenshot.

The Lenovo Windows Disk Management shows the external disk same as in PC1. Confirms that the problem is in the external disk only.

Install PW version 9.1 on your Lenova . Plug in only the 320 GB Seagate external. (Safely remove all other USB connected storage devices)

Post a full screenshot of Windows Disk Management as well as the screenshot of PW9.1 showing the drives
.
@Megahertz,

Do you have any idea of what could have happened to the 320GB external drive?

Ok @Beldar, I do not know how I got stuck with Balder. May be I am coneheaded . Only Ghot who sees coneheads can tell .

In post #4, Megahertz asked a pertinent question "Drive 2 isn't formatted as NTFS (may have other format) and has no letter assigned to it.Did you use it on Mac or Linux?"

The PW9.1 shows your Seagate external as "Other". This can happen if your Seagate external was formatted as exfat. PW 9.1 does not recognise exfat. That may be one reason why it shows as "other". What is your take on it? Do you know whether your Seagate was exfat or NTFS?

I got a couple of External USB Drives by WDC and the package was marked as for PC and Mac, they were formatted as exFAT. Mac OS X can read NTFS but not write it without installing more software [I had a MacBook Pro until it died when trying to install the new macOS]. I use Linux Mint on a computer and a Notebook, great for the little Notebooks with 32GB drives that due to storage limit can't run the last few Versions of Win10 [need at least 64GB].

A useful feature of exFAT is elimination of the 4GB single-file-size limit of 4GB of FAT32 and use on larger drives/partitions of 32GB.

For manipulating partitions a third-party software is GPARTED bootable LiveCD or LiveUSB, works outside of an installed Windows. It is also included in many versions of Linux. And GPARTED can create and format FAT32 drives larger than 32GB, I have done up to 500GB with it.