A quick followup on this, since it's not _directly_ germaine to
gpsd, but it can be useful info.
My most reliable SD cards so far have been...Patriots! I bought
individual ones more than a year ago. They are fast, overclock
better than any of my other SD cards, and I've never experienced
corruption (knock wood). So who knows what happened with yours - a
bum batch, damaged in shipping, we'll probably never know.
I'll add that I had mentioned the Silicon Power SD cards that I'd
recently bought. They have been trouble-free so far, however - the
Raspi actually *underclocks* them from the default 50MHz bus down to
25Mhz! I cannot run them at standard or overclocked, at all, so
needless to say, performance is poor.
I've been doing my own set of benchmarks similar to those Jeff
Geerling has published -
http://www.pidramble.com/wiki/benchmarks/microsd-cards
https://www.jeffgeerling.com/blog/2018/raspberry-pi-microsd-card-performance-comparison-2018
And I'm finding similar results, although the Patriot cards are
coming up nearly in the same cohort as the good ones he's listed.
I've sort of focused on the lesser (translation: cheaper!) brands,
even knowing they generally are unlikely to perform as well (testing
is still ongoing).
Don't know if the chart below will render properly to the list or
not. If not, I can post elsewhere if there's interest.
|
Card Make/Model
|
Bus speed
|
hdparm buffered
|
dd write
|
4K random read
|
4k random write
|
|
Patriot LX 16gb SDHC Class 10 UHS-1
|
100 MHz
|
36.7 MB/sec
|
8.1 MB/s
|
8.06 MB/s
|
3.80 MB/s
|
|
Sandisk Ultra 16gb SDHC Class 10 UHS-1 A1
|
50 MHz
|
22.7 MB/sec
|
17.1 MB/s
|
8.08 MB/s
|
2.20 MB/s
|
|
Sandisk Ultra 16gb SDHC Class 10 UHS-1 A1
|
83 MHz
|
37.0 MB/sec
|
17.9 MB/s
|
9.38 MB/s
|
2.22 MB/s
|
|
Sony 16gb SDHC Class 10 UHS-1
|
83 MHz
|
35.3 MB/sec
|
9.2 MB/s
|
5.9 MB/s
|
0.26 MB/s
|
|
Transcend 16gb SDHC Class 10 UHS-1
|
83 MHz
|
37.0 MB/sec
|
15.5 MB/s
|
8.65 MB/s
|
1.53 MB/s
|
|
Silicon Power 16gb SDHC Class 10 UHS-1
|
25 MHz
|
11.4 MB/sec
|
10.3 MB/s
|
3.55 MB/s
|
0.69 MB/s
|
|
Transcend 8gb
SDHC Class 6
|
50 MHz
|
17.1 MB/sec
|
11.6 MB/s
|
gave up
|
gave up
|
|
Kingston 16gb SDHC Class 10 UHS-1
|
83 MHz
|
34.4 MB/sec
|
9.6 MB/s
|
5.37 MB/s
|
0.45 MB/s
|
On 7/29/2018 14:05 PM, Alan Scott
wrote:
Paul:
I purchased Patriots also from amazon got the 5 pack of them.
Yes they are very reasonably priced, but ANYTHING COULD have
happened to those cards, even after arriving in my possession,
and face it, I have a LOT of MAG mount antenna laying around
here, so I simply am going to suggest this, and I will defer to
GEMiller for a "correct" or MORE-correct than simply scribbling
zeros or random data across the card prior to any use or re-use,
I personally could care less about "burning" a write session on
the card........face it at some point THEY ALL WILL FAIL.
So weather it fails today, or tonight because I "burned" one
Read/Write session on it, I could care less, this is why I carry
backups......(enough about best practices)......
Alan
On 07/28/2018 01:25 AM, Paul
Theodoropoulos wrote:
On 7/28/2018 1:03 AM, Alan Scott wrote:
There is nothing whatsoever wrong
with the "clockmaker" script / build recipe.......As
gemiller said to me in an email it's very probable that I
got a batch of "bad" micro SD cards because the exact same
recipe failed after attempting on 4 separate but "brand
new" micro SD cards, same brand, same source, same
shipping method all together in the same package and even
stored by myself in the same container / location....so
what ever may have effected one of them p
Hi Alan,
Would you be willing to share the brand/source/specifics of the
cards that were bad? Never hurts to be able to scratch something
off the list of potential purchases if they have a high failure
rate.
Myself, I have both "Patriot" brand and "Silicon Power" brand in
use on my Raspi's, with no confirmed failures (the "Patriot"
ones in service for over a year, the Silicon Power ones in use
only a few weeks, but no issues thus far). Got both brands on
Amazon, 16gb sized (only because 16gb seems to be the sweet spot
for having current/good specs and great prices - often less
expensive than the 8gb's.)
--
Paul Theodoropoulos
www.anastrophe.com
--
Paul Theodoropoulos
www.anastrophe.com
|