Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
why not NTFS?
Need to be portable yo non-exFAT-compatible machines.
These were out of a security camera system, with unreadable
file contents.
No mfr info when probed.
RL
Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
why not NTFS?
Need to be portable yo non-exFAT-compatible machines.
These were out of a security camera system, with unreadable
file contents.
No mfr info when probed.
Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
why not NTFS?
Need to be portable yo non-exFAT-compatible machines.
These were out of a security camera system, with unreadable
file contents.
No mfr info when probed.
RL
On 7/31/2025 7:17 AM, legg wrote:
Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
What do you mean "only offer"? How/where are you seeing this?
It may be that their current format is "offered" as the NEW
format choice. I've seen similar problems trying to coax a
card to be FAT32 formatted, etc.
DISKPART is the goto tool to avoid MS's idea of what you
WANT the medium to be.
[Note that the card reader can also impose limits on the
medium by not revealing its "true self"]
"legg" <legg@nospam.magma.ca> wrote in message news:fbum8k5giq5hgme980bk610c8kpuhqnda7@4ax.com...
Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
why not NTFS?
I'd try Rufus.
If it's unreadable then I'd look into whether Hiren's boot cd (usb) has anything useful.
Otherwise it's likely not recoverable unless an expensive specialist service can do it.
If the client wants the data no matter what the cost then don't do anything other than send it to a specialist service.
On 7/31/2025 7:17 AM, legg wrote:
Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
What do you mean "only offer"? How/where are you seeing this?
It may be that their current format is "offered" as the NEW
format choice. I've seen similar problems trying to coax a
card to be FAT32 formatted, etc.
It's actually 'offered' in the formatting options, but never
completes successfully. It tells me so, and the result is
a RAW disc. Quick exFAT format gets the card back again.
DISKPART is the goto tool to avoid MS's idea of what youI'm told that some cards are also device-specific.
WANT the medium to be.
[Note that the card reader can also impose limits on the
medium by not revealing its "true self"]
On 7/31/2025 1:37 PM, legg wrote:
On 7/31/2025 7:17 AM, legg wrote:
Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
What do you mean "only offer"? How/where are you seeing this?
It may be that their current format is "offered" as the NEW
format choice. I've seen similar problems trying to coax a
card to be FAT32 formatted, etc.
It's actually 'offered' in the formatting options, but never
completes successfully. It tells me so, and the result is
a RAW disc. Quick exFAT format gets the card back again.
Try DISKPART and see which "formats" seem to work vs. fail.
I think you need to CLEAN (?) the medium first (removes all
vestiges of partition table). Note, also, that some media
has reserved areas that make them difficult to completely
"erase" (and, of course, you aren't truly erasing it)
DISKPART is the goto tool to avoid MS's idea of what youI'm told that some cards are also device-specific.
WANT the medium to be.
[Note that the card reader can also impose limits on the
medium by not revealing its "true self"]
Try DISKPART and see which "formats" seem to work vs. fail.
I think you need to CLEAN (?) the medium first (removes all
vestiges of partition table). Note, also, that some media
has reserved areas that make them difficult to completely
"erase" (and, of course, you aren't truly erasing it)
They are strange animals.
One, which produced a flakey NTSF format has a 1.5MB invisible
disk usage.Disk management identified it as having an MBR.
DISKPART is the goto tool to avoid MS's idea of what youI'm told that some cards are also device-specific.
WANT the medium to be.
[Note that the card reader can also impose limits on the
medium by not revealing its "true self"]
I'm checking out what a 256GB part ($50 with mfr and warranty)
will do when used as intended. NTSF no obvious problem, so far.
The 516GB cards giving issues were an order of magnitude or two
cheaper. ie junk.
Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
why not NTFS?
Need to be portable yo non-exFAT-compatible machines.
These were out of a security camera system, with unreadable
file contents.
No mfr info when probed.
RL
On 2025-07-31 16:17, legg wrote:
Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
why not NTFS?
Need to be portable yo non-exFAT-compatible machines.
These were out of a security camera system, with unreadable
file contents.
No mfr info when probed.
RL
Did you try the offical formatter?
https://www.sdcard.org/downloads/formatter/
Arie
On 7/31/2025 7:17 AM, legg wrote:
Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
why not NTFS?
Need to be portable yo non-exFAT-compatible machines.
These were out of a security camera system, with unreadable
file contents.
You may find that they don't NEED a formal filesystem but
may just be handled as a raw block device; just store video in
the "current block" and when exhausted, move on to the next
block /in sequence/. When you get to the last physical
block, wrap around and OVERWRITE the first block. Thus,
all you need to do is track the current block number to be
able to reconstruct the stored data (which could also
include tags interspersed with the video).
It's a camera. It doesn't need to be able to store emails,
spreadsheets, music, etc. so why burden the implementation
with support for something that isn't really needed?
[It could also be broken! :> ]
No mfr info when probed.
RL
I mapped a tar device onto a sdcard. In practice you could allocate
a file and write a sequential image with no overhead, just sequential
blocks like on a tape.
The advantage that it is actually in practive a random access device
and you could e.g. read a part of a disk video.
There are no clusters are some idiocy, and the capacity is not limited
to 160 kbyte then 32 Mbyte then 32 Gbyte like Microsoft.
Groetjes Albert
On Thu, 31 Jul 2025 08:12:38 -0700, Don Y
<blockedofcourse@foo.invalid> wrote:
On 7/31/2025 7:17 AM, legg wrote:
Some recently acquired 512GB SDXC cards offer only exFAT formatting
under W7.
What do you mean "only offer"? How/where are you seeing this?
It may be that their current format is "offered" as the NEW
format choice. I've seen similar problems trying to coax a
card to be FAT32 formatted, etc.
It's actually 'offered' in the formatting options, but never
completes successfully. It tells me so, and the result is
a RAW disc. Quick exFAT format gets the card back again.
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