在開盤數(shù)據(jù)恢復(fù)更換磁頭后，發(fā)現(xiàn)新的磁頭工作不穩(wěn)定。這是因?yàn)槊總€(gè)磁頭都有其獨(dú)特的自適應(yīng)參數(shù)。這些參數(shù)存儲(chǔ)在ROM的模塊47中。
Sometimes after heads stack replacement the new heads stack works not stable. That occurs because every heads stack has its unique adaptive parameters. Those parameters are stored in module 47 of ROM.

一批生產(chǎn)的硬盤都對應(yīng)一組適配參數(shù)，與生產(chǎn)日期有關(guān)， 也是為什么我們建議在硬盤數(shù)據(jù)恢復(fù)時(shí)選擇備件盤時(shí)要選用生產(chǎn)日期故障盤盡可能接近的原因，有些來自同一家族的磁頭不匹配可能就是因?yàn)閭€(gè)原因
The adaptive parameters are more different from one batch of drives to another and is connected with date of manufacture. That is why it is recommended to select donor drive for heads stack with the closest date of manufacture possible. Some heads stacks from exactly the same drive as your patients can be totally incompatible due to these parameters.

在圖中，您可以看到來自同一型號驅(qū)動(dòng)器的兩組自適應(yīng)參數(shù)的比較。這些頭是兼容的。如果比較具有相同數(shù)字的頭的參數(shù)（磁頭0和磁頭0，磁頭1和磁頭1等），我們可以看到
At the image you can see the comparison of two sets of adaptive parameters from the same model drives. These heads stacks are compatible. We can see it if compare the parameters of heads with the same number (Head 0 to Head 0, Head 1 to Head 1, etc).

C4A – C32 = 18

CE0 – CC1 = 1F

C58 – C34 = 24

CDC – CC3 = 19

可接受的值差值應(yīng)小于100。如果值的差值超過300 ，則會(huì)出現(xiàn)數(shù)據(jù)讀取的嚴(yán)重問題。在這種情況下，您應(yīng)該尋找另一個(gè)備件的磁頭。
The acceptable difference of the values should be less than 100. If the difference of the values is more than 300 then serious problems with data reading will appear. In such case you should look for another heads stack donor.

因此，如果您可以在更換磁頭部之前檢查參數(shù)，那么您可以預(yù)測備件盤的磁頭部是否兼容。
So if you can check that parameters before the replacement of heads stack then you can predict whether the donor head stack is compatible or not.

為了使讀取更加穩(wěn)定，我們可以在ROM模塊47中進(jìn)行調(diào)整，使自適應(yīng)參數(shù)更適合新的磁頭。
To make reading more stable we can do adjustments in ROM module 47 to make the adaptive parameters more suitable for the new heads stack.

這個(gè)想法是取故障盤參數(shù)和備件盤參數(shù)的平均值。
The idea is to make the parameters average in the range between old patient parameters and the new donor parameters.

下面是操作流程
Here is the procedure how to do that.

該過程可以在正常和內(nèi)核模式下完成。
The procedure can be done both in Normal and Kernel mode.

Heads stacks settings (adaptives) are kept in 47-th ROM module. To make them suitable for another HDA, we need to modify them in a special way.

單擊“工具” – >“實(shí)用程序擴(kuò)展” – >“查看和編輯硬盤資源”。
Click “Tools” -> “Utility extensions” -> “View and edit HDD resouces”.

選擇“ ROM ”選項(xiàng)卡，然后選擇“ ROM模塊 ”和“ 47 SA適配器 ”。按“確定”?按鈕，實(shí)用程序?qū)⒆x取并打開此模塊。
Select “ROM” tab and then select “ROM module” and “47 SA Adaptives”. Press the “OK”?button, and the utility will read and open this module.

按“ Plugins?”按鈕，選擇“ Microjogs editor?”。
Press the “Plugins” button and choose “Microjogs editor”.

然后按“ Make average ”按鈕，選擇您的故障盤ROM的47模塊。雙擊它。
Then press the “Make averaged” button and choose the 47th ROM module of YOUR PATIENT DRIVE. Double-click it.

現(xiàn)在我們可以看到兩個(gè)硬盤之間的Microjog值的差異。
Now we can see the difference in Microjog values between both drives.

特別要注意的是，備件盤和故障盤之間的Microjog值的差異對于磁頭讀取數(shù)據(jù)的能力是非常重要的。Microjog值差異越小，Head stack的兼容性就越大。
Pay special attention to the fact that the difference in Microjog values between donor and patient modules (and HDAs) is extremely important for the ability of heads to read data. The smaller the Microjog value difference – the greater the compatibility of Head stack.

可接受的差異通常應(yīng)小于100.如果值的差值超過300，則會(huì)出現(xiàn)嚴(yán)重的數(shù)據(jù)讀取問題。如果兩個(gè)驅(qū)動(dòng)器頭組之間的差異大于300，則尋找另一個(gè)備件盤，因?yàn)檫@磁頭不適合作為備件。
The acceptable difference usually should be less than 100. If the difference of values exceeds 300, serious problems with data reading will appear. If the differences between two drives head stacks are greater than 300, then look for another donor because this one is not suitable to be heads stack donor.

按“ 確定 ”按鈕。如果我們向下滾動(dòng)，我們可以看到在模塊中修改的字節(jié)。它們被突出顯示。
Press the “OK” button. If we scroll down we can see the bytes which are modified in the module. They are highlighted.

按“ 寫入硬盤 ”按鈕寫入修改的模塊。
Press the “Write to HDD” button to write the modified module.

現(xiàn)在我們應(yīng)該用新參數(shù)重新啟動(dòng)驅(qū)動(dòng)器，并檢查磁頭是否與新的自適應(yīng)參數(shù)正常工作。所以我們關(guān)閉電源并重新啟動(dòng)該實(shí)用程序。如果驅(qū)動(dòng)器正確初始化，我們可以繼續(xù)使用Data Extractor恢復(fù)數(shù)據(jù)，否則我們需要使用一個(gè)與故障盤的Microjogs值更相近的磁頭。
Now we should restart the drive with new parameters and check if the heads work correctly with new adaptive parameters. So we switch power off and restart the utility. If the drive initializes correctly, we can proceed to Data Extractor to copy data, otherwise we need to look for another donor drive with more suitable Microjogs.

轉(zhuǎn)載請注明：成都千喜數(shù)據(jù)恢復(fù)中心 » 使用PC-3000 for HDD開盤恢復(fù)數(shù)據(jù)怎么適配西數(shù)硬盤磁頭