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Not sure if anyone's still reading this list, but this seems to be a new
situation and I'd like to get some more thoughts on this.
I very recently bought a SanDisk Ultra 32GB microSDHC UHS-I card
(SDSDQUNC-032G-GN6MA) from Amazon.com (directly, not a third-party
seller on Amazon). The card I received is the first SanDisk card I've
seen to report an oemid other than 0x5344 "SD", in this case 0x5054
"PT":
$ cat /sys/block/mmcblk0/device/oemid
0x5054
$ cat /sys/block/mmcblk0/device/manfid
0x000003
$ cat /sys/block/mmcblk0/device/name
SL32G
$ cat /sys/block/mmcblk0/device/fwrev
0x0
$ cat /sys/block/mmcblk0/device/hwrev
0x3
$ cat /sys/block/mmcblk0/device/serial
0xdacb171b
It's also a slightly smaller card than I'd expect based on previous
SanDisk 32 GB card purchases (though that could just be additional flash
set aside for the FTL to work with), and reports a different address
than my older SanDisk SD cards (which all report address aaaa):
mmc0: new high speed SDHC card at address 0007
mmcblk0: mmc0:0007 SL32G 28.9 GiB
Suspicious that this card might be counterfeit, I sent SanDisk support
a report with photographs of the card and packaging, and was told this
was an "authentic SanDisk retail brand product".
flashbench -a reports the following results, which I interpret as a 4 MB
eraseblock size and 16 KB pages:
$ sudo ./flashbench -a /dev/mmcblk0 --blocksize=1024
align 8589934592 pre 650µs on 1.01ms post 687µs diff 342µs
align 4294967296 pre 643µs on 976µs post 685µs diff 312µs
align 2147483648 pre 595µs on 963µs post 651µs diff 340µs
align 1073741824 pre 619µs on 978µs post 652µs diff 343µs
align 536870912 pre 620µs on 975µs post 660µs diff 335µs
align 268435456 pre 598µs on 955µs post 643µs diff 335µs
align 134217728 pre 633µs on 971µs post 665µs diff 322µs
align 67108864 pre 620µs on 979µs post 679µs diff 330µs
align 33554432 pre 604µs on 975µs post 659µs diff 343µs
align 16777216 pre 624µs on 962µs post 674µs diff 313µs
align 8388608 pre 609µs on 956µs post 678µs diff 313µs
align 4194304 pre 614µs on 980µs post 682µs diff 332µs
align 2097152 pre 630µs on 942µs post 673µs diff 291µs
align 1048576 pre 594µs on 912µs post 667µs diff 281µs
align 524288 pre 639µs on 926µs post 660µs diff 277µs
align 262144 pre 612µs on 912µs post 666µs diff 273µs
align 131072 pre 618µs on 921µs post 649µs diff 288µs
align 65536 pre 588µs on 896µs post 652µs diff 276µs
align 32768 pre 582µs on 901µs post 631µs diff 295µs
align 16384 pre 582µs on 888µs post 631µs diff 281µs
align 8192 pre 602µs on 776µs post 645µs diff 152µs
align 4096 pre 612µs on 842µs post 661µs diff 205µs
align 2048 pre 649µs on 639µs post 639µs diff -4751ns
The controller appears to be able to keep nine eraseblocks open at once
in random mode:
$ sudo ./flashbench -O /dev/mmcblk0 --open-au-nr=1 --random
4MiB 2.12M/s
2MiB 2.32M/s
1MiB 7.58M/s
512KiB 2.18M/s
256KiB 2.25M/s
128KiB 2.17M/s
64KiB 2.18M/s
32KiB 2.04M/s
16KiB 1.79M/s
$ sudo ./flashbench -O /dev/mmcblk0 --open-au-nr=2 --random
4MiB 2.13M/s
2MiB 2.76M/s
1MiB 9.07M/s
512KiB 2.67M/s
256KiB 2.73M/s
128KiB 2.58M/s
64KiB 2.6M/s
32KiB 2.36M/s
16KiB 2.04M/s
$ sudo ./flashbench -O /dev/mmcblk0 --open-au-nr=4 --random
4MiB 2.3M/s
2MiB 2.53M/s
1MiB 8.97M/s
512KiB 2.43M/s
256KiB 2.45M/s
128KiB 2.34M/s
64KiB 2.34M/s
32KiB 2.15M/s
16KiB 1.88M/s
$ sudo ./flashbench -O /dev/mmcblk0 --open-au-nr=8 --random
4MiB 2.3M/s
2MiB 2.41M/s
1MiB 8.98M/s
512KiB 2.31M/s
256KiB 2.34M/s
128KiB 2.24M/s
64KiB 2.24M/s
32KiB 2.07M/s
16KiB 1.82M/s
$ sudo ./flashbench -O /dev/mmcblk0 --open-au-nr=9 --random
4MiB 2.31M/s
2MiB 2.39M/s
1MiB 9.39M/s
512KiB 2.3M/s
256KiB 2.34M/s
128KiB 2.23M/s
64KiB 2.22M/s
32KiB 2.06M/s
16KiB 1.81M/s
$ sudo ./flashbench -O /dev/mmcblk0 --open-au-nr=10 --random
4MiB 2.36M/s
2MiB 2.43M/s
1MiB 2.73M/s
512KiB 1.4M/s
256KiB 1.02M/s
128KiB 537K/s
64KiB 276K/s
32KiB 141K/s
16KiB 69.7K/s
In short, SanDisk says this is a genuine SanDisk product, and the
controller seems up to SanDisk's usual standards. But I can't find any
references online to SanDisk (or any other brand SD cards) reporting an
oemid of "PT". Has anyone else seen a card like this out there?
-Steven Luo
Order watches, bags, jewelry- http://goo.gl/LKxZL3
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Hi Arnd,
As you asked for flashbench results, here's some:
Transcend µSDcard 2GB :
flashbench -a /dev/mmcblk1
align 536870912 pre 3.24ms on 3.8ms post 2.67ms diff 845µs
align 268435456 pre 3.05ms on 3.6ms post 2.53ms diff 814µs
align 134217728 pre 3.11ms on 3.65ms post 2.56ms diff 814µs
align 67108864 pre 3.07ms on 3.65ms post 2.52ms diff 854µs
align 33554432 pre 3.08ms on 3.63ms post 2.49ms diff 851µs
align 16777216 pre 3.09ms on 3.59ms post 2.58ms diff 756µs
align 8388608 pre 3.25ms on 3.82ms post 2.68ms diff 850µs
align 4194304 pre 2.93ms on 3.5ms post 2.52ms diff 772µs
align 2097152 pre 2.96ms on 3.51ms post 2.49ms diff 788µs
align 1048576 pre 2.45ms on 2.5ms post 2.47ms diff 37.6µs
align 524288 pre 2.46ms on 2.47ms post 2.5ms diff -7440ns
align 262144 pre 2.45ms on 2.47ms post 2.51ms diff -13815n
align 131072 pre 2.45ms on 2.47ms post 2.49ms diff 2.15µs
align 65536 pre 2.45ms on 2.47ms post 2.49ms diff -1188ns
align 32768 pre 2.45ms on 2.46ms post 2.5ms diff -15476n
Seems to be a 2MiB eraseblock
Kingston µSD-HC card 4GB:
flashbench -a /dev/mmcblk1
align 1073741824 pre 1.76ms on 2.09ms post 1.86ms diff 280µs
align 536870912 pre 1.75ms on 2.09ms post 1.88ms diff 274µs
align 268435456 pre 1.76ms on 2.1ms post 1.88ms diff 279µs
align 134217728 pre 1.75ms on 2.1ms post 1.89ms diff 275µs
align 67108864 pre 1.75ms on 2.11ms post 1.9ms diff 282µs
align 33554432 pre 1.74ms on 2.09ms post 1.91ms diff 269µs
align 16777216 pre 1.92ms on 2.26ms post 1.88ms diff 362µs
align 8388608 pre 1.76ms on 2.1ms post 1.87ms diff 280µs
align 4194304 pre 1.75ms on 2.09ms post 1.88ms diff 268µs
align 2097152 pre 1.72ms on 1.91ms post 1.88ms diff 110µs
align 1048576 pre 1.85ms on 2.02ms post 1.85ms diff 171µs
align 524288 pre 1.72ms on 1.88ms post 1.85ms diff 98.5µs
align 262144 pre 1.72ms on 1.91ms post 1.88ms diff 108µs
align 131072 pre 1.73ms on 1.9ms post 1.87ms diff 96.3µs
align 65536 pre 1.72ms on 1.9ms post 1.86ms diff 105µs
align 32768 pre 1.72ms on 1.88ms post 1.85ms diff 89.5µs
Seems to be a standard 4MiB eraseblock.
Emmc 32GB:
./flashbench -a /dev/mmcblk0
align 8589934592 pre 467µs on 470µs post 470µs diff 1.25µs
align 4294967296 pre 470µs on 469µs post 466µs diff 976ns
align 2147483648 pre 472µs on 473µs post 476µs diff -1154ns
align 1073741824 pre 479µs on 487µs post 483µs diff 5.83µs
align 536870912 pre 474µs on 480µs post 481µs diff 2.9µs
align 268435456 pre 490µs on 497µs post 486µs diff 8.85µs
align 134217728 pre 485µs on 485µs post 486µs diff -145ns
align 67108864 pre 491µs on 493µs post 480µs diff 7.05µs
align 33554432 pre 495µs on 490µs post 495µs diff -4414ns
align 16777216 pre 491µs on 496µs post 495µs diff 2.32µs
align 8388608 pre 500µs on 504µs post 491µs diff 8.27µs
align 4194304 pre 475µs on 492µs post 497µs diff 6.63µs
align 2097152 pre 478µs on 477µs post 481µs diff -1896ns
align 1048576 pre 481µs on 488µs post 488µs diff 3.58µs
align 524288 pre 489µs on 489µs post 484µs diff 2.3µs
align 262144 pre 487µs on 485µs post 479µs diff 1.92µs
align 131072 pre 477µs on 477µs post 486µs diff -4437ns
align 65536 pre 484µs on 487µs post 481µs diff 4.52µs
align 32768 pre 485µs on 478µs post 484µs diff -6095ns
I didn't see a pattern on this one.
regards,
Richard
Hi!
I am unsubscribing this mailing list due to what seems to excessive spam
originating from China.
In case you still want to reply to any of my posts, i.e. regarding my
little shell script to automate analysis of cards and sticks a bit, using
flashbench, then please CC me.
This basically appears to be pretty quiet and unmaintained anyway.
Thanks,
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
