From: Matti Linnanvuori <mattilinnanvuori@xxxxxxxxx>
Add IDEDISK_MULTI_MODE text adapted from hdparm manual page.
Signed-off-by: Matti Linnanvuori <mattilinnanvuori@xxxxxxxxx>
---
--- a/drivers/ide/Kconfig 2007-10-26 19:21:15.017817500 +0300
+++ b/drivers/ide/Kconfig 2007-10-26 19:42:56.759696000 +0300
@@ -152,9 +152,22 @@ config BLK_DEV_IDEDISK
If unsure, say Y.
config IDEDISK_MULTI_MODE
- bool "Use multi-mode by default"
+ bool "Use multiple sector mode for Programmed Input/Output by default"
help
- If you get this error, try to say Y here:
+ This setting is irrelevant for most IDE disks, with direct memory
+ access, to which multiple sector mode does not apply. Multiple sector
+ mode is a feature of most modern IDE hard drives, permitting the
+ transfer of multiple sectors per Programmed Input/Output interrupt,
+ rather than the usual one sector per interrupt. When this feature is
+ enabled, it can reduce operating system overhead for disk Programmed
+ Input/Output. On some systems, it also can increase the data
+ throughput of Programmed Input/Output. Some drives, however, seemed
+ to run slower with multiple sector mode enabled. Some drives claimed
+ to support multiple sector mode, but lost data at some settings.
+ Under rare circumstances, such failures could result in massive
+ filesystem corruption.
+
+ If you get the following error, try to say Y here:
hda: set_multmode: status=0x51 { DriveReady SeekComplete Error }
hda: set_multmode: error=0x04 { DriveStatusError }
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