root@ttyp0[hdc1]# /sbin/hdparm -d1 /dev/hdc /dev/hdc: setting using_dma to 1 (on) using_dma = 1 (on) root@ttyp0[hdc1]# /sbin/hdparm /dev/hdc /dev/hdc: multcount = 0 (off) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) geometry = 36483/255/63, sectors = 586114704, start = 0 root@ttyp0[hdc1]# /sbin/hdparm -I /dev/hdc /dev/hdc: ATA device, with non-removable media Standards: Likely used: 1 Configuration: Logical max current cylinders 0 0 heads 0 0 sectors/track 0 0 -- device size with M = 1024*1024: 0 MBytes device size with M = 1000*1000: 0 MBytes Capabilities: IORDY not likely Cannot perform double-word IO R/W multiple sector transfer: not supported DMA: not supported PIO: pio0 root@ttyp0[hdc1]# dd if=/dev/hdc bs=512 count=1 | od -t x1 dd: reading `/dev/hdc': 入力/出力エラーです 読み込んだブロック数は 0+0 書き込んだブロック数は 0+0 0 bytes transferred in 1.180163 seconds (0 bytes/sec) 0000000