Late last year, I bought a Psion Series 5 from eBay. It included a case, extra styluses, a modem, and a data cable. I loved the thing. Unfortunately, I couldn't get the device to recognize Compact Flash cards. Looking it up, this was a widely known issue, often caused by a tiny piece of the compact flash door breaking off inside of the device. This is supposed to press a button inside the device when the door is closed to activate the compact flash port. It seemed loose when I opened up the device, so I tried to fix it, and after days of messing with it off and on, it broke off, and nothing I did could get it to work.

Last week, I tried to work on the device to get it to work and it stopped working altogether. I bought a replacement and it came in Monday, and while the casing was in near perfect condition, the compact flash port still didn't work. Nothing inside was broken. I searched on the internet and found a YouTube video. They said to make sure to format the card in FAT16, which I have been doing this whole time.

Then they said to make sure that I left some space at the end of the drive unallocated. So I took my 2GB Compact Flash card and left about 200 MB unallocated, formatted it as FAT16.... And that FINALLY worked. I'm wondering if that was my problem the whole time. I hope this helped someone.... #Psion5 #PDA #CompactFlash #90sTech

@jhooper That is incredibly frustrating, but I'm happy to hear that you got it working.

The formatting on some of these older devices is very particular.

A few weeks ago I was upgrading the ROM on my #PocketPC. I fiddled with it all day long and could not get it to read the files from the SD card.

When the system was running normally it could read the SD card but when I was attempting to upgrade through the boot loader it would see nothing.

I wasn't sure if the files were bad or if it was the SD card or if it was the formatting, so I tried everything.

Multiple different versions of the upgrade files, different SD cards, I formatted in Fat 32 with various programs and nothing.

Finally there was a tip in a really old forum that I found where someone said they had to format it in Windows XP.

I pulled out an old Windows XP laptop and formatted the card in Fat32 with the basic Windows formatting tool and the upgrade worked immediately!

So strange...

@Judeau I ended up using mini tools partition wizard to get the formatting just right. The formatting system in Windows 11 is very limited

@jhooper I haven't heard of that program. I'll have to take a look at that.

In my case, I thought for sure Rufus could format my SD card properly, and perhaps it could have, but I just didn't have all the various settings tweaked just right so the Pocket PC refused to read it.

It's odd to me that the Fat 32 formatting in Windows 10 wouldn't work, but Windows XP worked with no issues.

I thought these things were standardized? I wonder what's different in the formatting from one version of Windows to the other that caused it to not be read?

I just found it to be such an oddity.

@Judeau it could be the cluster sizes. I know Windows 11 tends to set that fairly high.