{"id":51342,"date":"2020-04-28T10:11:01","date_gmt":"2020-04-28T17:11:01","guid":{"rendered":"https:drivesaversdatarecovery.com\/\/?p=51342"},"modified":"2024-01-19T01:20:29","modified_gmt":"2024-01-19T09:20:29","slug":"what-is-an-sd-card-anyway","status":"publish","type":"post","link":"https:\/\/drivesaversdatarecovery.com\/fi\/blog\/what-is-an-sd-card-anyway\/","title":{"rendered":"Mit\u00e4 SD-kortti oikeastaan on?"},"content":{"rendered":"
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\n\t\t\t\n\t\t<\/div>\n\t<\/div>\nKoska tietojenk\u00e4sittely alkoi useita vuosikymmeni\u00e4 sitten, k\u00e4ytt\u00e4j\u00e4t ovat etsineet tapoja siirt\u00e4\u00e4 tietojaan helposti yhdest\u00e4 laitteesta toiseen. Vuosien varrella siirrett\u00e4v\u00e4\u00e4 tallennustilaa on ollut monenlaisia muodoissa \u2013 jotkut niist\u00e4 ovat hieman hienostuneempia kuin toiset.<\/p>\n

T\u00e4m\u00e4 saattaa olla yll\u00e4tys, mutta ensimm\u00e4inen irrotettava tallennusv\u00e4line oli itse asiassa punch-kortti. Kortti suunniteltiin 1950-luvulla tallentamaan erilaisia tietoja, jotka sitten sy\u00f6tettiin tietokoneeseen. Kone luetti n\u00e4pp\u00e4ilyj\u00e4 ja tulkki tietoja.<\/p>\n

Sielt\u00e4 alkoi magneettilevyt, jotka hallitsivat tietojenk\u00e4sittely\u00e4 1960- ja 1970-luvuilla, mutta lopulta korvattiin ne 1980- ja 1990-luvuilla levysoittimilla ja CD-ROM-levyill\u00e4. Mutta heti kun uusi vuosisata alkoi, k\u00e4ytt\u00e4j\u00e4t ja niiden laitteet vaativat uudenlaista tallennustapaa: flash-muistia.<\/p>\n

Flash-muistia on monenlaisia muotoja. T\u00e4llainen tallennustila liittyy useimmiten USB-muistitikuihin, mutta flash-tekniikkaa k\u00e4ytet\u00e4\u00e4n my\u00f6s SD-kortteissa.<\/p>\n

Mik\u00e4 on SD-kortti?<\/h2>\n

SD-kortit eli Secure Digital -kortit ovat pienikokoisia flash-muistilaitteita, jotka ovat yleistyneet digitaalikameroiden ja \u00e4lypuhelimien yleistymisen my\u00f6t\u00e4. Useimmissa n\u00e4iss\u00e4 laitteissa tarvitaan SD-kortti tietojen tallentamiseen. Kortti, joka on usein nelj\u00e4nnestuuman kokoinen tai pienempi, voidaan ottaa pois yhdest\u00e4 laitteesta ja laittaa toiseen nopeasti ja helposti tietojen siirt\u00e4miseksi.<\/p>\n

N\u00e4m\u00e4 laitteet tarjoavat runsaasti tehoa ja tallennustilaa niiden koosta riippuen. Vastaavantyyppisiin puukortteihin ja magneettilevyihin verrattuna SD-kortit ovat yksi tapa mitata sit\u00e4, kuinka paljon tietojenk\u00e4sittely on muuttunut ajan my\u00f6t\u00e4.<\/p>\n

Mutta mik\u00e4 tekee SD-kortit toimimaan? Onko SD-kortteja eri tyyppej\u00e4? Mit\u00e4 k\u00e4ytt\u00e4j\u00e4n pit\u00e4isi tehd\u00e4, jos SD-kortti ep\u00e4onnistuu? Lue lis\u00e4\u00e4.<\/p>\n

Miten SD-kortti toimii?<\/h2>\n

Kuten aiemmin mainittiin, SD tarkoittaa \u201csecure digital\u201d, mutta mit\u00e4 SD-kortti oikeastaan on? Jotta ymm\u00e4rt\u00e4isit SD-kortteja ja niiden toimintaa, sinun on ensin ymm\u00e4rrett\u00e4v\u00e4 flash-muisti.<\/p>\n

Flash-asemat ovat kiinte\u00e4sti\u00e4 tallennustilaa, mik\u00e4 tarkoittaa, ett\u00e4 niiss\u00e4 ei ole liikkuvia mekaanisia osia. N\u00e4m\u00e4 laitteet ovat 100-prosenttisesti elektronisia ja kirjoittavat ja poistavat tietoja sek\u00e4 kirjoittavat niit\u00e4 uudelleen. Flash-tallennusteknologian ainutlaatuisuutta on kyky suorittaa kaikki n\u00e4m\u00e4 toiminnot rajatulla tilavuudella, sill\u00e4 flash-tallennusteknologia on tunnettu pienist\u00e4 ja eritt\u00e4in kannettavista laitteistaan.<\/p>\n

SD-kortit ovat flash-tallennustavan muotoa. Ne ovat yleens\u00e4 postimerkin tai vastaavan kokoisia ja ovat alle tuuman paksuisia. Niiss\u00e4 k\u00e4ytet\u00e4\u00e4n pieni\u00e4 piirilevyj\u00e4 ja ne reagoivat s\u00e4hk\u00f6virtaan tallentaakseen tietoja. Sama teknologia mahdollistaa tiedon palauttamisen mink\u00e4 tahansa laitteen SD-kortinlukijalla.<\/p>\n

Useimmissa SD-kortteissa on SDHC-protokolla, joka tarkoittaa \u201csecure data high capacity\u201d -tekniikkaa. T\u00e4m\u00e4 protokolla mahdollistaa SD-korttien k\u00e4ytett\u00e4v\u00e4n jopa 32 gigatavua tietoa. SDHC oli ratkaiseva muutos SD-korttien maailmassa, sill\u00e4 se teki niist\u00e4 monien kulutuselektroniikan k\u00e4ytt\u00e4jien suosiman vaihtoehdon suuren tallennustilansa (ja hinta-laatusuhteensa) vuoksi.<\/p>\n

My\u00f6s suurempia SD-kortteja on kuitenkin pian saatavilla markkinoilla. Uusi protokolla nimelt\u00e4\u00e4n secure data extended capacity (SDXC) mahdollistaa SD-korttien k\u00e4ytett\u00e4vyyden jopa 2 teratavun tiedon kanssa. T\u00e4m\u00e4 teknologia on viel\u00e4 kehitteill\u00e4, mutta pian se luo SD-kortteja, joilla on viel\u00e4 suurempia tallennuskapasiteetteja.<\/p>\n

Mit\u00e4 eroja on SD-korttien v\u00e4lill\u00e4?<\/h2>\n

Kuten jo mainittiin, SD-kortteja varten on erilaisia protokollia (SDHC ja SDXC), mik\u00e4 varmasti muodostaa kaksi erilaista tyyppi\u00e4. Mutta niit\u00e4 on my\u00f6s useita eri kokoja. SD-kortit ovat saatavilla tavallisessa, minis\u00e4vyisess\u00e4 ja mikro-kokoisessa muodossa.<\/p>\n

Kun SD-kortit tulivat markkinoille, tavallinen koko oli varsin suosittu ja yleisesti pidettiin standardina. Tavallinen koko on 32 x 24 mm, mik\u00e4 mahtuu useimpiin tietokoneisiin ja digitaalikameroihin. Kuluttajat tulivat nopeasti rakastumaan t\u00e4h\u00e4n kompaktiin tallennusratkaisuun, ja samalla kun laitteet pienittyiv\u00e4t, pienentyiv\u00e4t my\u00f6s SD-kortit.<\/p>\n

Mini-SD-kortit on kehitetty sopimaan pienempiin digitaalikameroihin ja muihin vastaaviin mediaan. Ne ovat kooltaan 21,5 x 20 mm. Laitteet, joissa on vain tavallinen SD-korttipaikka, voivat helposti k\u00e4ytt\u00e4\u00e4 sovittimia liit\u00e4nt\u00e4\u00e4n mini-SD-kortteja tavalliseen kokoiseen porttiin. T\u00e4m\u00e4ntyyppisi\u00e4 SD-kortteja k\u00e4ytet\u00e4\u00e4n kuitenkin harvoin nyky\u00e4\u00e4n, koska mikro-SD-kortti, joka on paljon mini-SD:n pienempi sukulainen, on ohittanut pienen flash-tallennustilan markkinan.<\/p>\n

Mikro-SD-kortit ovat pienimm\u00e4t t\u00e4h\u00e4n asti olevat kortit, kooltaan 15 x 11 mm ja paksuudeltaan vain 1 mm. Kun matkapuhelimet kehittyiv\u00e4t entist\u00e4 \u00e4lykk\u00e4\u00e4mmiksi ja pienemmiksi, tarvittiin pienempi\u00e4 tallennusratkaisuja. Mikro-SD-kortit sopivat t\u00e4ydellisesti t\u00e4h\u00e4n ja niit\u00e4 k\u00e4ytet\u00e4\u00e4n usein lis\u00e4t\u00e4viksi \u00e4lypuhelimien ja muiden pienikokoisien laitteiden sis\u00e4isi\u00e4 tallennuskapasiteetteja.<\/p>\n

Kuinka paljon SD-kortit maksavat?<\/h2>\n

Kun SD-kortit ensimm\u00e4ist\u00e4 kertaa tulivat markkinoille, ne olivat melko kalliita. Vain 15 vuotta sitten voit ostaa 4 Gt:n mini-SD-kortin helposti $100 eurolla. Mutta tuona aikana on jo mennyt aikaa, ja kuten useimmissa tallennusv\u00e4lineiss\u00e4, SD-korttien hinta on laskenut huomattavasti.<\/p>\n

T\u00e4ss\u00e4 on tietoa siit\u00e4, mit\u00e4 voit odottaa maksavasi SD-kortille vuonna 2020:<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>

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Kuten n\u00e4ette, hinnat ovat vertailukelpoiset ja joissakin tapauksissa mikrokortti on edullisempi kuin tavallinen SD-kortti. Valinta riippuu kuitenkin todellisuudessa laitteen SD-portin tyypist\u00e4. SD-kortin ostaminen on melko helppoa, mutta varmista aina, ett\u00e4 tietokoneesi tarvitsee juuri sit\u00e4 tyyppi\u00e4.<\/p>\n

Mit\u00e4 jos SD-kortti vikaantuu?<\/h2>\n

Teknologia on loistava aina siihen asti, kunnes se ep\u00e4onnistuu. Mik\u00e4\u00e4n ei rakenna niin, ett\u00e4 se olisi k\u00e4ytt\u00f6kelpoinen loputtomiin, eik\u00e4 SD-kortteja ole erilaisia. Kuten kaikissa muistiteknologioissa, ne pystyv\u00e4t kirjoittamaan ja kirjoittamaan tietoja vain ennalta m\u00e4\u00e4r\u00e4ttyjen m\u00e4\u00e4r\u00e4aikojen aikana.<\/p>\n

Ennen kuin laitteesi kaatuu, varmista, ett\u00e4 tietosi on varmuuskopioitu paikalliselle kiintolevylle, pilvipohjaiseen tallennusratkaisuun tai molempiin. S\u00e4\u00e4st\u00e4t itsellesi p\u00e4\u00e4ns\u00e4rky\u00e4, kun SD-kortti kaatuu.<\/p>\n

Jos sinulla ilmenee SD-kortin vioittuminen eik\u00e4 sinulla ole varmuuskopioa, ota heti yhteys tietojen palauttamista tarjoavaan asiantuntijaan. \u00c4l\u00e4 yrit\u00e4 ratkaista ongelmaa itse\u2026 koska saatat vain pahentaa tilannetta!<\/p>\n

Datapalautusasiantuntijat ovat eritt\u00e4in koulutettuja ja hyvin varustautuneita arvioimaan ja palauttamaan tietojanne olosuhteista riippumatta. Ota yhteytt\u00e4 DriveSaversiin<\/a> ennen kuin SD-kortti ep\u00e4onnistuu seuraavan kerran.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"Since computing began several decades ago, users have looked for ways to easily move their data from one device to another. Over the years, moveable storage has come in many forms\u2014some with a bit more finesse than others. This may come as a surprise, but the first form of removable storage was actually a punch…","protected":false},"author":25,"featured_media":67207,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"inline_featured_image":false,"footnotes":""},"categories":[264],"tags":[],"post_series":[],"class_list":["post-51342","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","entry","has-media"],"acf":[],"yoast_head":"\nWhat is an SD card, anyway?<\/title>\n<meta name=\"description\" content=\"SD cards have been on the portable storage scene for nearly two decades. But what are SD cards, really? 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