19. 磁頭 / 碟片飛行高度和污染物的比較 Today's hard drive heads typically “fly” at around 100Å above the media 今天典型 的磁頭 “飛行” 在 碟片上 100Å For comparison: 為比較 : Head Fly Height ~100Å
20.
21. 今天的硬盤都已經使用 (G)MR 磁頭從碟片上讀寫資料 典型的硬盤磁頭的設計 MR READING element Inductive WRITING element WRITE SIGNALS READ SIGNALS
25. Maximize Areal Density 最大化地區密度 Capacity is measured by Areal Density 容量由地區密度測量 Areal Density = TPI x BPI (Gbits/in 2 ) where: TPI = tracks per inch 每英寸磁道數 BPI = bits per inch 位 元 每英寸 To hold more data, need more TPI and BPI 須要 更多資料 , 需要更多 TPI 和 BPI As capacity increases, bit sizes must decrease , making It more difficult to write and read the magnetic signal 當容量增 大 , 位元 體積 必須減少 , 使它更難寫和讀磁性信號 Consumers Wants Bigger Capacity Drives 消費者想要更大的容量
26. tracks 磁道 bits Higher Areal Density is Always a Challenge 密度的挑戰 1989 Today Less magnetic signal to read 比較上磁力信號弱
32. HDS Operations – 制造基地 Malaysia Thailand Fremont, CA Thailand Head R&D Wafer Fab Slider HGA HSA HD HD PCBA
33. Head Manufacturing Flow 磁头制造流程 Total Cycle Time: 49-52 days to completed HD Cycle Time from wafer start to HSA = 46 days Slider Fab Wafer Fab HD FGI HSA HGA 59 days 63 days 46 days Mfr B Mfr A WD Comparative Wafer Start to HSA Cycle Times Wafer Under-Coating WD Fremont WD Thailand
34. Fremont Resources – Professional Staff BS/BA 34% MS/MA 25% PhD 34% Diploma 7% Exempt Staff Experience: 18 Years New staff (non-RR): 13% Management Experience: 20 Years New staff (non-RR): 16% PhD 20% MS/MA 23% BS/BA 33% Diploma 24%
