{"id":444,"date":"2004-09-16T19:32:19","date_gmt":"2004-09-16T18:32:19","guid":{"rendered":"http:\/\/localhost\/wordpress\/?p=444"},"modified":"2004-09-16T19:32:19","modified_gmt":"2004-09-16T18:32:19","slug":"hitachi-deskstar-7k250","status":"publish","type":"post","link":"https:\/\/blog.cernosice.cz\/index.php\/2004-09-16-hitachi-deskstar-7k250","title":{"rendered":"Hitachi Deskstar 7K250"},"content":{"rendered":"

S\u00a0v\u011bt\u0161\u00ed objedn\u00e1vkou hardware jsem se rozhodl ud\u011blat si radost a po\u0159\u00eddil jsem si nov\u00fd disk do serveru Hitachi Deskstar 7K250<\/a> s\u00a0kapacitou 160\u00a0GB a 8\u00a0MB cache, jako n\u00e1hradu za jeden Seagate Barracuda 7200.7<\/a> (120\u00a0GB, 8\u00a0MB\u00a0cache), kter\u00e9 jsem m\u011bl\u00a0dva.<\/p>\n

Nyn\u011bj\u0161\u00ed sestava je tak Hitach 160\u00a0GB a Seagate 120\u00a0GB. Podle zku\u0161enost\u00ed z\u00a0provozu provedu pozd\u011bji pravd\u011bpodobn\u011b upgrade i\u00a0druh\u00e9ho disku Seagate.<\/p>\n

Pokud se div\u00edte kapacit\u011b, tak v\u011b\u0159te, \u017ee d\u011blat pravideln\u00e9 z\u00e1lohy image pracovn\u00edho disku na notebooku vy\u017eaduje spousty\u00a0m\u00edsta.<\/p>\n

Popis produktu na Czech Computer\u00a0\u2013 Hitachi Deskstar 7K250<\/a>:<\/p>\n

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Firma Hitachi p\u0159evzala od IBM odd\u011blen\u00ed v\u00fdroby pevn\u00fdch disk\u016f a tento model je z\u00e1stupcem jejich nov\u00e9 \u0159ady 7K250, kter\u00e1 navazuje na p\u0159edchoz\u00ed 180GXP. M\u00e1 kapacitu 160GB, 8MB vyrovn\u00e1vac\u00ed pam\u011bti, ot\u00e1\u010d\u00ed se rychlost\u00ed 7.200\u00a0ot\u00e1\u010dek za minutu a dod\u00e1v\u00e1 se v\u00a0proveden\u00ed pro rozhran\u00ed ATA. Zm\u011bnou oproti star\u0161\u00ed \u0159ad\u011b 180GXP je pou\u017eit\u00ed 80GB ploten nam\u00edsto men\u0161\u00edch 60GB (maxim\u00e1ln\u00ed kapacita 250GB) a tak\u00e9 modely s\u00a0podporou rozhran\u00ed Serial ATA.<\/p>\n

\t\u0158ada 7K250, stejn\u011b jako 180GXP, opl\u00fdv\u00e1 \u0159adou zaj\u00edmav\u00fdch technologi\u00ed. Tak nap\u0159\u00edklad \u201etag ‚n seek\u201c\u00a0\u2013 zjednodu\u0161en\u011b se jedn\u00e1 o\u00a0postup zpracov\u00e1n\u00ed p\u0159\u00edchoz\u00edch \u0159\u00edd\u00edc\u00edch p\u0159\u00edkaz\u016f a jejich vz\u00e1jemn\u00e9 uspo\u0159\u00e1d\u00e1n\u00ed tak, aby je bylo mo\u017en\u00e9 n\u00e1sledn\u011b prov\u00e9st s\u00a0co nejv\u011bt\u0161\u00ed rychlost\u00ed a efektivitou (jedn\u00e1 se o\u00a0pokro\u010dilou technologii ne nepodobnou n\u011bkter\u00fdm postup\u016fm ze sv\u011bta SCSI disk\u016f). Zn\u00e1m\u00e1 fluidn\u00ed lo\u017eiska FDB v\u00a0motorech se pod\u00edlej\u00ed na sn\u00ed\u017een\u00e9 provozn\u00ed hlu\u010dnosti 2.6\u00a0bel\u016f. Tento konkr\u00e9tn\u00ed model je p\u0159ipraven na rozhran\u00ed ATA-6\u00a0a dosahuje pr\u016fm\u011brn\u00e9 p\u0159\u00edstupov\u00e9 doby 8.8ms<\/p>\n

\tDisky t\u00e9to nov\u00e9 \u0159ady najdou uplatn\u011bn\u00ed t\u00e9m\u011b\u0159 v\u0161ude\u00a0\u2013 lze je pou\u017e\u00edt ve v\u00fdkonn\u011bj\u0161\u00edch desktopech i\u00a0levn\u011bj\u0161\u00edch serverech, pro modern\u00ed hry a n\u00e1ro\u010dn\u00e9 aplikace i\u00a0pro neline\u00e1rn\u00ed editov\u00e1n\u00ed video z\u00e1znam\u016f. Pokud dva disky zapoj\u00edte do RAID 0\u00a0pole (nap\u0159. na desk\u00e1ch vybaven\u00fdch Promise nebo HighPoint \u0159adi\u010dem), mile V\u00e1s p\u0159ekvap\u00ed rychlost bootov\u00e1n\u00ed, nab\u00edh\u00e1n\u00ed Va\u0161ich aplikac\u00ed a her. Jedn\u00e1 se o\u00a0disky s\u00a0nejmen\u0161\u00ed spot\u0159ebou a vyza\u0159ov\u00e1n\u00edm tepla mezi vysoce v\u00fdkonn\u00fdmi IDE\u00a0disky.<\/p>\n<\/blockquote>\n

V\u0161imli jste si toho, \u017ee disky s\u00a0kapacitou 160\u00a0GB maj\u00ed v\u00a0sou\u010dasn\u00e9 dob\u011b nejlep\u0161\u00ed pom\u011br ceny\/kapacita? Koukn\u011bte se t\u0159eba Czech Computer\u00a0\u2013 Pevn\u00e9 disky PATA<\/a>.<\/p>\n

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Hitachi Deskstar 7K250<\/strong>
\n\t80\u00a0GB \/ 1669\u00a0K\u010d = 20,86\u00a0K\u010d\/GB (2\u00a0MB\u00a0cache)
\n\t120\u00a0GB \/ 2260\u00a0K\u010d = 18,83\u00a0K\u010d\/GB (8\u00a0MB\u00a0cache)
\n\t160\u00a0GB \/ 2470\u00a0K\u010d = 15,44\u00a0K\u010d\/GB<\/strong> (8\u00a0MB\u00a0cache)
\n\t200\u00a0GB \/ 3474\u00a0K\u010d = 18,76\u00a0K\u010d\/GB (8\u00a0MB\u00a0cache)
\n\t250\u00a0GB \/ 4508\u00a0K\u010d = 18,03\u00a0K\u010d\/GB (8\u00a0MB\u00a0cache)
\n\t400\u00a0GB \/ 10920\u00a0K\u010d = 27,30\u00a0K\u010d\/GB (8\u00a0MB\u00a0cache)<\/p>\n<\/blockquote>\n

Rychl\u00fd, ale hlu\u010dn\u00fd?<\/h3>\n

Chod disku je velmi tich\u00fd, p\u0159ekvapil m\u011b v\u0161ak hlu\u010dn\u00fd seek a proto\u017ee u\u017e jsem n\u011bkde \u010detl o\u00a0AAM<\/abbr>, ihned jsem na\u0161el pot\u0159ebn\u00e9 informace.<\/p>\n

AAM<\/abbr> (Automatic Acoustic Management) je technologie, d\u00edky kter\u00e9 je mo\u017en\u00e9 regulovat hlu\u010dnost a z\u00a0toho odvozen\u00fd v\u00fdkon pevn\u00fdch disk\u016f. Pokud chcete sn\u00ed\u017eit hlu\u010dnost nebo naopak pon\u011bkud zv\u00fd\u0161it v\u00fdkon va\u0161eho pevn\u00e9ho disku (a nevad\u00ed v\u00e1m trochu hlasit\u011bj\u0161\u00ed projev), ur\u010dit\u011b si p\u0159e\u010dt\u011bte AAM: pane, je libo tich\u00fd nebo rychl\u00fd disk?<\/a>.<\/p>\n

Disk jsem nejd\u0159\u00edve zkusil otestovat progr\u00e1mkem HD Tach<\/a>, provedl zti\u0161en\u00ed disku, resp. sn\u00ed\u017een\u00ed rychlosti pohybu hlavi\u010dek a po op\u011btovn\u00e9m otestov\u00e1n\u00ed mus\u00edm konstatovat, \u017ee zat\u00edmco hluk vyd\u00e1v\u00e1 v\u00fdrazn\u011b ni\u017e\u0161\u00ed, zm\u011bna v\u00a0rychlosti se t\u00e9m\u011b\u0159 neprojevila.<\/p>\n