Nice.
http://www.spinics.net/lists/linux-btrfs/msg36918.html
No special tool needed. e.g. I just tested this with Gnome Disks, with the
default "don't overwrite with zeros (quick format)" option, using btrfs. All
of, and only that chosen partition, was completely erased in about 2 seconds.
Ev
PNY SDHC card, 16GB - pretty generic. In this case fstrim did work (pfft yeah
whatever it didn't the last time I tried it), and so did mkfs.btrfs but they
work differently according to strace.
fstrim issues:
ioctl(3, FITRIM, 0x7fffbf6b87e0)= 0
The result is
write(1, "/mnt/: 13.9 MiB (14
SD Specifications
Part 1
Physical Layer
Simplified Specification
Version 4.10
https://www.sdcard.org/downloads/pls/simplified_specs/part1_410.pdf
page 38
4.3.5 Erase
It is desirable to erase many write blocks simultaneously in order to enhance
the data throughput. Identification of these write b
On Aug 21, 2014, at 11:00 AM, Chris Adams wrote:
> Once upon a time, Chris Murphy said:
>> However, quite a few sdcards don't respond to trim.
>
> Do _any_ SD cards support TRIM? I didn't think that was supported by
> the protocol at all.
It's a good question. fstrim spit back a message to t
Once upon a time, Chris Murphy said:
> However, quite a few sdcards don't respond to trim.
Do _any_ SD cards support TRIM? I didn't think that was supported by
the protocol at all.
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Chris Adams
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On Aug 21, 2014, at 6:51 AM, Robert Moskowitz wrote:
> More on my compressing images from SDcards.
>
> I only need the boot info and 1st partition, so I remove the other
> partitions, but of course there is still 1s out there so it will not compress
> efficiently. I want to zero out the end o
On 08/21/2014 09:50 AM, Chris Adams wrote:
Once upon a time, Robert Moskowitz said:
# dd if=/dev/zero of=/dev/sdb bs=1M seek=1007620
Well, man says about seek:
seek=N skip N obs-sized blocks at start of output
and obs defaults to 512 bytes, and I *THOUGHT* fdisk was reporting #
51
Once upon a time, Robert Moskowitz said:
> >># dd if=/dev/zero of=/dev/sdb bs=1M seek=1007620
> Well, man says about seek:
>
>seek=N skip N obs-sized blocks at start of output
>
> and obs defaults to 512 bytes, and I *THOUGHT* fdisk was reporting #
> 512 blocks, not bytes.
fdisk report
On Thu, 21 Aug 2014, Robert Moskowitz wrote:
>
> On 08/21/2014 09:07 AM, Robert P. J. Day wrote:
> > On Thu, 21 Aug 2014, Robert Moskowitz wrote:
> >
> > > More on my compressing images from SDcards.
> > >
> > > I only need the boot info and 1st partition, so I remove the other
> > > partitions,
>
On 08/21/2014 09:07 AM, Robert P. J. Day wrote:
On Thu, 21 Aug 2014, Robert Moskowitz wrote:
More on my compressing images from SDcards.
I only need the boot info and 1st partition, so I remove the other partitions,
but of course there is still 1s out there so it will not compress efficiently
On 08/21/2014 07:51 AM, Robert Moskowitz wrote:
More on my compressing images from SDcards.
I only need the boot info and 1st partition, so I remove the other
partitions, but of course there is still 1s out there so it will not
compress efficiently. I want to zero out the end of the card so fi
On Thu, 21 Aug 2014, Robert Moskowitz wrote:
> More on my compressing images from SDcards.
>
> I only need the boot info and 1st partition, so I remove the other partitions,
> but of course there is still 1s out there so it will not compress efficiently.
> I want to zero out the end of the card so
More on my compressing images from SDcards.
I only need the boot info and 1st partition, so I remove the other
partitions, but of course there is still 1s out there so it will not
compress efficiently. I want to zero out the end of the card so first I
use fdisk:
# fdisk -l /dev/sdb
Disk /de
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