Technical data

3.3 IDE/ATA/SATA

disk, the reason may be that the IDE controller only supports lower modes. Furthermore, the

achievable values also depend on the physical abilities of the hard disk, i.e. a hard disk with

UDMA-6 (theoretically 133 MB/sec) currently achieves an actual transfer rate of about

60 MB/sec.

3.3.4 Bus master IDE controllers

Precondition for using DMA mode is that the attached PCI IDE controller also supports the Bus

master IDE standard. This is the case for most of the established internal and external IDE con -

trollers. Whether your PCI IDE controller supports Bus master IDE can be determined by means

of the program PCISniffer, if necessary, which can be downloaded for free at

http://www.miray.de/download/sat.pcisniffer.html. The field 'Classcode' in PCISniffer has to con-

tain the value 01018x (x = arbitrary) for the respective PCI IDE controller.

Note: For using Bus master IDE, the settings and initializations made in and by the PC’s system

BIOS play a major role. In case of HDShredder having problems with utilizing DMA, it is likely

that certain BIOS settings have to be accommodated accordingly. (7.4.3 Problems with

DMA).

3.3.5 Speed

The speed that can be achieved with DMA always depends on the physical abilities of the re-

garding hard disk. The following rough classification shows the approximate speed that can be

expected by a certain drive type:

Typ Age Speed

older drives about 5-10 years about 1-20 MB/sec

newer drives about 2-5 years about 20-40 MB/sec

top models about 0-2 years about 40-90 MB/sec and more

3.4 SCSI

In case you have an edition of HDShredder which also supports SCSI hard disks, the following

chapter provide important information regarding utilization and compatibility of SCSI drives and

controllers.

Note: As HDShredder embeds original driver code of the hardware manufacturers, Miray

Software has no influence on actual compatibility. Hence, the following statements are of in-

formative nature only, are based on specifications of the manufacturer and are not legally

binding (8.3 Disclaimer).

3.4.1 Utilization

You can use HDShredder with SCSI hard disk in the same way as with any other media. HD-

Shredder automatically recognizes supported SCSI controllers and connected SCSI hard disks at

program start and displays them, along with other recognized media, in the according selective

lists.