Salve, ho installato una debian su un pc con processore Sempron3000 hd 40Gb 512Mb ram ddr2. ho riscontrato però una lentezza incredibile, quando un programma tenta di accedere al disco perfino il mouse comincia ad andare a scatti.

questo è l'output di hdparm -I /dev/hda
codice:
/dev/hda:

ATA device, with non-removable media
	Model Number:       SAMSUNG SP40A2H                         
	Serial Number:      0469J1FW260177      
	Firmware Revision:  RR100-07
Standards:
	Used: ATA/ATAPI-6 T13 1410D revision 1 
	Supported: 6 5 4 
Configuration:
	Logical		max	current
	cylinders	16383	16383
	heads		16	16
	sectors/track	63	63
	--
	CHS current addressable sectors:   16514064
	LBA    user addressable sectors:   78242976
	device size with M = 1024*1024:       38204 MBytes
	device size with M = 1000*1000:       40060 MBytes (40 GB)
Capabilities:
	LBA, IORDY(cannot be disabled)
	Standby timer values: spec'd by Standard, no device specific minimum
	R/W multiple sector transfer: Max = 16	Current = ?
	Recommended acoustic management value: 128, current value: 0
	DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5 
	     Cycle time: min=120ns recommended=120ns
	PIO: pio0 pio1 pio2 pio3 pio4 
	     Cycle time: no flow control=120ns  IORDY flow control=120ns
Commands/features:
	Enabled	Supported:
	    	SMART feature set
	    	Security Mode feature set
	   *	Power Management feature set
	   *	Write cache
	   *	Look-ahead
	   *	Host Protected Area feature set
	   *	WRITE_BUFFER command
	   *	READ_BUFFER command
	   *	DOWNLOAD_MICROCODE
	    	SET_MAX security extension
	    	Automatic Acoustic Management feature set
	   *	Mandatory FLUSH_CACHE
	   *	SMART error logging
	   *	SMART self-test
Security: 
		supported
	not	enabled
	not	locked
	not	frozen
	not	expired: security count
		supported: enhanced erase
	48min for SECURITY ERASE UNIT. 48min for ENHANCED SECURITY ERASE UNIT.
HW reset results:
	CBLID- above Vih
	Device num = 0 determined by the jumper
Checksum: correct
mentre questo è l'output di hdparm -d /dev/hda

codice:
/dev/hda:
 using_dma    =  0 (off)
provando ad abilitare il dma

codice:
calimero:/home/matteo# hdparm -d1 -X udma4 /dev/hda

/dev/hda:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 setting xfermode to 68 (UltraDMA mode4)
 using_dma    =  0 (off)
oppure così

codice:
calimero:/home/matteo# hdparm -d1 /dev/hda

/dev/hda:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)
ottengo lo stesso risultato (non si riesce ad abilitare...)