●ベンチマーク。 http://plaza18.mbn.or.jp/~moriban/linux/HardDiskPerformance.html 参考。

1. [読み込み速度]

   
   cat << EOF > read.sh
   for i in [1] [2] [3] [4] [5] [6] [7] [8] [9] [10];do sleep 10;echo \$'\n\n' \$i;hdparm -t /dev/hde;done
   EOF
   sh read.sh > read.dat
   
   grep MB read.dat
   

    Timing buffered disk reads:   66 MB in  3.02 seconds =  21.87 MB/sec
    Timing buffered disk reads:   72 MB in  3.04 seconds =  23.69 MB/sec
    Timing buffered disk reads:   72 MB in  3.04 seconds =  23.70 MB/sec
    Timing buffered disk reads:   58 MB in  3.05 seconds =  19.02 MB/sec
    Timing buffered disk reads:   66 MB in  3.31 seconds =  19.93 MB/sec
    Timing buffered disk reads:   72 MB in  3.04 seconds =  23.71 MB/sec
    Timing buffered disk reads:   68 MB in  3.19 seconds =  21.34 MB/sec
    Timing buffered disk reads:   72 MB in  3.04 seconds =  23.71 MB/sec
    Timing buffered disk reads:   72 MB in  3.07 seconds =  23.49 MB/sec
    Timing buffered disk reads:   72 MB in  3.05 seconds =  23.60 MB/sec
   

   読み込みは問題無し。
2. [書き込み速度]
   # 512M ファイル書き込み10回

   cat << EOF > write.sh
   for i in [1] [2] [3] [4] [5] [6] [7] [8] [9] [10];do sleep 10;echo \$'\n\n' \$i;date;time dd if=/dev/zero of=/home/hdparm_write\$i.tmp ibs=1M obs=1M count=512;date;done
   EOF
   sh write.sh >& write.dat
   
   grep MB write.dat
   
   

    536870912 bytes (537 MB) copied, 2.28629 seconds, 235 MB/s
    536870912 bytes (537 MB) copied, 34.73 seconds, 15.5 MB/s
    536870912 bytes (537 MB) copied, 229.395 seconds, 2.3 MB/s
    536870912 bytes (537 MB) copied, 233.12 seconds, 2.3 MB/s
    536870912 bytes (537 MB) copied, 122.304 seconds, 4.4 MB/s
    536870912 bytes (537 MB) copied, 271.558 seconds, 2.0 MB/s
    536870912 bytes (537 MB) copied, 146.169 seconds, 3.7 MB/s
    536870912 bytes (537 MB) copied, 253.022 seconds, 2.1 MB/s
    536870912 bytes (537 MB) copied, 203.075 seconds, 2.6 MB/s
    536870912 bytes (537 MB) copied, 316.44 seconds, 1.7 MB/s
   

   読み込みは 20MB/s位だが、書き込みは始めはバッファでごまかされるものの、実効速度は 2MB/s位の模様。
   えらい遅いなー
   
   (2007/8/30) 本原追加
3. ウェブ上に仕様が出ていた。 書き込み最大8MB/secか。そういうことだったのですな。
4. というわけで、MTRONのSATA6000シリーズの32GBのものを追加購入。 仕様ではSustained Read 100MB/sec, Sustained Write 80MB/secとなっている。
   ということは、Transcendのものよりも10倍以上速くなるか？
   
   とはいえ、こんな記事 も出ていて、少し心配。