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Config: WinUAE 4.2.1, CPU 68020, 24bit, FPU 68882, 8MB FastRam Z2, A1200, CF 4GB Transcend, BetterWB 43, Dopus 4,

When I try to copy folders from PC to CF Partition (2.4GB, pfs3) it goes alright, but then unexpectedly throws bitmap error. I formatted and partitioned the card godzillion times already SFS, FFS, PFS. Same thing over and over again. Always correct MaxTransfer and Dostype were entered.

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    Have you tried the WinUAE support forum?
    – UncleBod
    Commented Jun 29, 2019 at 16:39
  • I've done this sort of thing - creating CF cards with Amiga native filesystems under UAE - with success. However, I've never been successful doing the same on WinUAE. I think UAE accessing raw block devices is better supported on non-Windows platforms. The most reliable and simplest method I've found is firing up MorphOS on an old Mac.
    – Brian H
    Commented Jun 29, 2019 at 18:53
  • Have you tried to replace the card?
    – lvd
    Commented Jul 1, 2019 at 10:39
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    Sounds like it could be a card issue alright. I've never had an issue like that with a CF card, SD card or mechanical hard drive when accessing via WinUAE, and it's used all the time by many people so I can't imagine it's a matter of being adequately supported under Windows. Is the 2.4GB partition located at the start or end of the drive? If it's at the end, try making it a little bit smaller. Sometimes the geometries don't match up, especially with older versions of HDToolbox, and this can make it thing the drive is slightly larger than it actually is.
    – Daedalus
    Commented Jul 1, 2019 at 22:18

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I remember receiving a CF card prepped by a friend. I read it with my basic multi-purpose card reader (which works very well for micro SD cards) and coïncidence (or not): the data was destroyed at first access and the card became unreadable.

My friend told me that those all-purpose card readers were low quality for the compact flash format, and recommended a specific CF card reader. Not doing a lot of formats but at least reading and writing CF format properly.

The brand that he recommended is Hama (note: I'm not affiliated with Hama, but it's the only card reader I have successfully tested).

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As you notice in the picture, there aren't 546 formats supported or any USB mug warmer. Just Compact flash and 2 others (that I never used). I've been using that device for a few months (with PFS3 and normal FFS) now and never had any issues, even with cheap CF cards.

I suppose that some other CF-specific card readers are as reliable. Just don't try cheap reader hardware on those cards. Invest in a specific reader.

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