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It is an alternative to Adaptec’s ASPI. The term ASPI is an acronym that stands for: Advanced SCSI Programming Interface. Operating systems and programs use ASPI drivers to communicate with ATAPI and SCSI devices. The files contained in an ASPI layer are also used in systems that don't contain a SCSI adapter, or SCSI devices... for things such as ripping CD audio and burning CDs.
However, many people preffer Patin-Couffin access layer because:
- ASPI is a registered trademark of ADAPTEC, which mean that we must pay to use or include ASPI in our software, and can't guarantee we will have the right to use it indefinitely.
- ASPI is UNRELIABLE, because there is more ASPI distribution than we can count. Some are very serious and stable, other introduces bugs and problems we can't cope with.
- ASPI does not provide a mechanism to obtain exclusive access on a given drive. this is needed to have a reliable read/write operation.
- Patin-Couffin Layer act faster on drive.
- Most ASPI layers are not plug and play, does not support hot plug and doesn't see units on USB, or firewire buses.
- and so on...
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