1. Compute the average read time for a Seagate Barracuda ST750DM003 hard drive using the attached manufacturer product specification. Use the listed value for average latency in place of average seek time in your calculations, and a sector size of 512 bytes (the specification lists 4096 byte sectors, but these are emulated as 512 byte sectors to the OS). Also use the listed value for average data rate in place of transfer rate, and assume the 0.1ms of controller overhead.

2. The table below represents an 8 block direct-mapped cache with write-through at some point during the execution of a program...

Index V Tag Data

000 Y 01 Mem[01000]

001 N

010 Y 10 Mem[10010]

011 N

100 N

101 N

110 Y 11 Mem[11110]

111 Y 00 Mem[00111]

a) Show the modified table after the following the following sequence of cache accesses (listed by word address): {0x19, 0x05, 0x07, 0x08, 0x14}. Assume that underlined accesses correspond to cache writes, while all others correspond to cache reads.

b) Which of the accesses from part 2a result in a cache hit?

3. The table below represents the same scenario as part 2 using a write-back cache...

Index V Tag Data Dirty

000 Y 01 Mem[01000] N

001 N N

010 Y 10 Mem[10010] N

011 N N

100 N N

101 N N

110 Y 11 Mem[11110] N

111 Y 00 Mem[00111] N

a) Show the modified table after the following the following sequence of cache accesses (listed by word address): {0x1F, 0x1D, 0x12, 0x1B, 0x1E}. Assume that underlined accesses correspond to cache writes, while all others correspond to cache reads.

b) Which of the accesses from part 3a result in a cache hit?

2.0 Drive Specifications Unless otherwise noted, all specifications are measured under ambient conditions, at 25C, and nominal power. For convenience, the phrases the drive and this drive are used throughout this manual to indicate the following drive models ST3000DM001 ST2000DM001 ST1500DM003 ST320DMO00 ST1000DM003 ST250DM000 ST750DM003 ST500DM002 2.1 Specification summary tables The specifications listed in Table 1 and Table 2 are for quick reference. For details on specification measurement or definition, refer to the appropriate section of this manual Table1 Drive specifications summary for 3TB, 2TB, 1.5TB, 1TB and 750GB models ST3000DM001; ST2000DM001 3000GB (3TB) 2000GB (2TB) 5,860,533,168 ST2000DM001 ST1500DM003 2000GB (2TB); 1500GB (1.5TB) 3,907,029,168; ST1000DM003; ST750DM003 1000GB (1TB) 750GB 1,953,525,168; 1,465,149,168 2 Drive Specification* Formatted capacity (512 bytes/sector)* Guaranteed sectors 3,907,029,168 6 3 2,930,277,168 Heads 2 Bytes per sector (4K physical 4096 4096 emulated at 512-byte sectors) Default sectors per track Default read/write heads Default cylinders Recording density (max) Track density (avg) Areal density (avg) 63 63 63 1807kFC 352ktracks/in 625Gb/in2 7200 RPM 2147Mb/s 1807kFCI 352ktracks/in 625Gb/in2 7200 RPM 2147Mb/s 1807kFCI 352ktracks/in 625Gb/in2 7200 RPM 2147Mb/s Internal data transfer rate Average data rate, read/write 15 156MB/s 156MB/s 156MB/s Maximum sustained data rate, 210MB/S OD read (MB/s) I/O data-transfer rate (max) Cache buffer 210MB/s 210MB/s 600MB/s 64MB 26.1mm /1.028 in 101.6mm /4.0 in (+0.010 in) 146.99mm/5.787 in 626g/1.38 lb 4.16ms 600MB/s 64MB 26.1mm/1.028 in 101.6mm /4-0 in ( 0.010 in) 146.99mm/5.787 in 600MB/s 64MB 20.17mm/0.7825 in 101.6mm / 4.0 in ( 0.010 in) 146.99mm/5.787 in 400g/0.88 lb 4.16ms Width (max) max 4.16ms Power-on to ready (max) Power-on to ready, 2.5A spin-up code o ption (t Barracuda SATA Product Manual, Rev. G