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    ͧǡѺ ԷҾͧ Harddisk
     
      ǹ˭͡촴ʡ¾Ԩóҷѡ ¤ӹ֧֧ԷҾ㹡÷ӧҹҡѡ
    ԷҾͧ촴ʡռŵöС÷ӧҹͧ

    ҧ á 觷ǧҡҹ鹡 ÷ҧդ´ҧ෤Ԥ ͷ¡໤ (specification) ͧ촴ʡ§Թ
    ѺִԴӤѭѺ໤ҧҧ˵

    ѧоҷءѹ;ٴ֧ ͡촴ʡ ͨӹǹҡӤѭ Ţ͡ѵҡ觼ҹ¹͡ (external transfer rate)
    ҡѺͺ (spindle speed) ͧ촴ʡ 觶ͧ١ͧ

    ҨҴ١ѹѺ ໤ҧԵк㹴ҵҪշ (data sheet) ໤ շ (spec sheet) ǢͧѺԷҾͧ촴ʡҧ
    ҤӤѭѺҡ˹ ¨Т¡͡ 2 ໤ͧѺԷҾ㹡ҵ˹ ໤ͧѺԷҾ㹡觼ҹ


    ໤ͧѺԷҾ㹡ҵ˹
      ҵ˹ (positioning) ¶֧ͧ촴ʡ㹡ùҹ/¹ ˹觷 ҹ/¹šѺ૤ͧ ໤ͧ촴ʡǢͧѺԷҾ㹡ҵ˹մѧ仹
    - Seek Time
      seek time ͪǧҷͤ㹡͹ҹ/¹ҡԹ ˹ѧաԹ˹ ͹ҹ/¹繡кǹԧ (mechanical process)
    ·дѺԹҷ (millisecond) ˹ǹѹͧԹҷ ֧ѺҤ͹ҧҡ () ºѺǧ硷͹ԡ軡öӧҹ˹ǧ
    ǧдѺԹҷ (nanosecond) ˹ǹѹҹͧԹҷҹ ҧ CPU ءѹöżʹҹ觵 1 Թҷ·


    ͹ҡûԹ seek time ͧѺ˹觢ͧԹ繨ش駵Шشش´ ͧҡѺҹ/¹令Ǣ˹
    ֧ѹҧ seek time Ѻзҧ (ҧҧԹ) ҹ/¹ͧ͹ ѹԧ
    ٴ seek time 㹡ҹ/¹ҡԹ 1 ѧԹ 3 2 Ңͧ seek time 㹡ҹ/¹ҡԹ 1 ѧԹ 2 ͧ
    ºѺâѺöҡҹѧʶҹ 2 ҷѺسԴе仹öз觢Ѻ ֧»·ҧ
    ѴǹµçѺзҧҡҹ֧ʶҹͧ ҤسТѺö˹ Դеö䢡ح͵Դͧ¹Դ§

    令 (ͺ)



    Ţ seek time ԵҺ 3
      1. Average ¶֧ǧ·㹡͹ҹ/¹ ҡԹ˹ѧաԹ˹Ẻ

    2. Track-to-Track ¶֧ǧҷ㹡͹ҹ/¹ ҡԹ˹ѧաԹ˹觷Դѹ
    駹 track-to-track seek time Ф ͹Ѻ cylinder switch time Сǵ· ·촴ʡ track-to-track seek time ҳ 1 Թҷ

    3. Full Stroke ¶֧ǧҷ㹡͹ҹ/¹ҡԹ ҹشѧԹҹ͡ش Ҩդҵ 15 仨֧ 20 Թҷ
    ҹ full stroke seek time Ѻ average seek time ԷҾͧ촴ʡ촴ʡբ ͺ
    ʹյ seek time 觷պҷ͡͡촴ʡҧҡ ѨغѹҷѧǴ٨йŧ 촴ʡ average seek time
    ҧѹҡѡ ǹ˭㹪ǧ 8 ֧ 10 Թҷ 촴ʡҡҨҡҹ 㹢з촴ʡẺ SCSI ҧ average seek time § 4 Թҷҹ


    - Settle Time
     
    settle time setting time ¶֧ǧҷ촴ʡҹ/¹ ʶë觾͡ҹ/¹ ѧҡҹ/¹١¨ҡԹ˹
    ѧաԹ˹ 촴ʡ仨 settle time ¡ 0.1 Թҷ ᵡҧѹҧ settle time ͧ촴ʡ/֧ͨչӤѭ
    ˵Եҧ settle time ǹ˹觢ͧ seek time


    - Command Overhead Time
     
    command overhead time ͪǧҹѺҡա觤ѧ촴ʡ з촴ʡԺѵԧҹ觹 繵Ţ͡촴ʡ
    öͺʹͧǴҡ§ » command overhead time դһҳ 0.5 -Թҷ
    ᵡҧѹҧ촴ʡ/͵ҧԵ֧ѡ к command overhead time Һçйǹ˹觢ͧ seek time ǡѹѺ settle time


     

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