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SD card pentru Raspberry Pi, care este mai bun ?
- 05 August 2012
- , autor Radu
Ai un RaspberryPi si vrei sa te pui pe treaba ? Felicitari!
Ce memorie SD sa folosesti ? Un 8GB ar fi suficient.
Cumperi una de clasa cat mai mare, sa fie rapida si gata, nu ?
NU, sunt multe carduri SD si pentru aceeasi clasa de viteza exista diferente mari de la model la model, de la producator la producator:
- in majoritatea cazurilor exista diferente mari intre ce scriu producatorii si testul real.
- viteza de X MB/sec afisata pe ambalaj se refera la citirea/scrierea secventiala. Asta e buna pentru aparate foto/video care scriu/citesc cate o poza de dimensiune mare. Pentru un sistem de operare care lucreaza si cu fisiere mici impartite in bucati si mai mici in spatiul de memorie, citirea se face in blocuri mici de memorie, iar in acest caz viteza de transfer este foarte mica.
Vezi mai jos cateva modele de memorii SDHC testate folosind aplicatia CrystalDiskMark.
Voi updata acest articol si cu alte modele de memorii SDHC testate.
Ai testat un card SD si vrei sa publici rezultatul aici ? Trimite-mi un mail.
Sony UHS-I SDHC 8GB class 10 - product code 495524847093
Toate testele prezentate aici s-au facut pe un laptop DELL Inspirion N5110 (Intel Core i7-2670QM, Win7 Home Edition x64) pe portul integrat de SD card.
Deoarece cardul SONY nici pe departe nu s-a apropiat de cei 94MB/s specificati pe ambalaj, l-am testat si pe un laptop SONY VAIO Z1311DG (Intel Core i7-3612QM, Win7 Professional x64). Rezultatele au fost mult mai bune pentru scrierea secventiala, dar similare pentru fisiere mici.
Din acest test rezulta ca limitarea la transfer secvential este si la nivelul interfetei cu cardul SD. Este posibil ca unele carduri tesate aici sa fie mai performante intr-un aparat foto, dar pentru transfer de fisiere mici, adica pentru Raspberry Pi, testele sunt corecte.
Patriot LX Series SDHC 8GB class 10 - product code 0879699008853
hama SDHC 8GB class 6 - product code 4007249908063
Transcend microSDHC 8GB class 6 - product code 760557815617
Kingmax microSDHC 16GB class 10
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comentarii
Stelian Leonard
Doresc sa programez un 18F2550. Mai sunt alte precizari in acest caz ?
Ca parere aveti despre "PIC 18Fxxx Parallel Port PIC Programmer" de aici:
http://www.foxdelta.com/products/art2003.htm
2013-07-11 11:29:53
Raspunde
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